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RESEARCH AND PRACTICE |
Elena S. H. Yu and Sawsan Abdulrahim are with the Division of Epidemiology and Biostatistics, Graduate School of Public Health, San Diego State University, San Diego, Calif. Edwin H. Chen is with the Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago. Katherine K. Kim is with the Kirkhof School of Nursing, Grand Valley State University, Allendale, Mich.
Correspondence: Requests for reprints should be sent to Elena S.H. Yu, PhD, MPH, Division of Epidemiology and Biostatistics, School of Public Health, San Diego State University, San Diego, CA 92182 (e-mail: eyu{at}mail.sdsu.edu).
| ABSTRACT |
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Objectives. This report describes and examines factors significantly associated with smoking among Chinese Americans, using multiple logistic regression methods.
Methods. We conducted a population-based survey (n = 644, age = 4069 years) in Chicago's Chinatown using a Chinese questionnaire based on the National Health Interview Survey (NHIS).
Results. Smoking prevalence was 34% for males and 2% for females. Some 93% of current smokers had smoked regularly for 10 or more years. Low education (odds ratio [OR] = 2.41; 95% confidence interval [CI] = 1.31, 4.46), use of a non-Western physician or clinic for health care (OR = 2.64; 95% CI = 1.46, 4.80), and no knowledge of early cancer warning signs and symptoms (OR = 2.52; 95% CI = 1.35, 4.70) were significantly associated with smoking among men.
Conclusions. The male prevalence of smoking is higher than those reported in California, the NHIS, and the Behavioral Risk Factor Surveillance System (BRFSS); exceeds the rate for African Americans aged 18 years and older; is comparable with the rate for African American males aged 45 to 64 years; and is far above the Healthy People 2010 target goal of less than 12%. Multisite surveys and smoking cessation campaigns in Chinese are needed.
| INTRODUCTION |
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Cigarette-smoking status and patterns of use among adults in the United States have been systematically monitored through programmatic surveys,811 analysis of birth certificates,12 and funded research. The National Health Interview Survey (NHIS) derives annual estimates of health characteristics (including smoking status) through a probability sample of noninstitutionalized civilian adults,8 while the Behavioral Risk Factor Surveillance System (BRFSS) provides state-based estimates of cigarette users among persons aged 18 years and older living in the 50 states and the District of Columbia.4 However, data are limited for Asian Americans and Pacific Islanders (AAPIs), now counted at more than 11 million8,13the fastest-growing ethnic minority group in the United States.
The Surgeon General's Report of 1998 is the latest nationwide review of the diverse tobacco control needs of major racial/ethnic minority groups, including AAPIs.14 The information conveyed by the aggregation of numbers masks important subgroup and regional differences. An understanding of the heterogeneity of cigarette use among AAPI subpopulations is crucial for the formulation of useful health policies and the development of sound intervention programs. The objectives of this report are to describe smoking behavior, knowledge, and beliefs among Chinese Americans and to better understand the factors associated with their knowledge and continuing use of cigarettes despite the known harmful effects.
In prevalence studies, "current smoking" (or cigarette use) is defined as having smoked at least 100 cigarettes in one's lifetime and currently smoking. The prevalence of cigarette use in China has been reported to be 33.8% for both sexes,1517 61% for men aged 15 years and older,1,3,7 and 73% for men aged 40 years and older.3 Three fifths of Chinese male smokers started smoking at 15 to 20 years of age.15 The target goal in China is to reduce the smoking rate for men aged 15 years and older to below 58%.18 Obviously, the smoking epidemic in China is on a different order of magnitude than that found in the United States today, where the goal for 2010 is to reduce the prevalence of smoking to less than 12%.19 For the general US population aged 18 years and older, the prevalence of cigarette smoking has declined from 29% in 198720 to 26% in 199421 and 24.7% in 1997.11
Although data on smoking are available from BRFSS and NHIS interviews conducted in English, the small sample size of AAPIs has hampered precise estimates. Researchers often have to pool data sets across years or concatenate disparate samples from different locations in order to obtain crude estimates for AAPIs, as was done in the Surgeon General's Report on tobacco use in 1998.14 The report showed a smoking rate for AAPIs of 23.8% from 1978 to 1980, which dropped to 15.3% in the period 1994 to 1995,14,21 only to increase to 16.9% in 1997.11 These results differ from that based on a recent BRFSS survey of AAPIs in the 10 states where they are most populous; this revealed a smoking prevalence of 10.7%,22 with sevenfold variation by state (4.7% in Maryland, 36.1% in Oregon). The sample size was too small to produce meaningful statistics for AAPI subpopulations, but studies in several localities showed heterogeneous smoking prevalence for different subgroups, ranging from 9.1% among Chinese Americans23 to 23.1% among Southeast Asians.24
Nearly 1 of every 4 AAPIs is of Chinese descent. Despite the high prevalence of tobacco use in China and the fact that the overwhelming majority (83%) of Chinese Americans aged 18 years and older are foreign born,25 the smoking prevalence reported for Chinese Americans is lowbetween 9.1% and 10.9%.23,25,26 Below, we review some important factors that have been reported to be associated with cigarette use among AAPIs and, specifically, Chinese Americans.
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| Age |
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| Education |
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| Spoken English Fluency |
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| Usual Source of Health Care |
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| Knowledge of Early Cancer Warning Signs and Symptoms |
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| METHODS |
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Instrument
We constructed both Mandarin and Cantonese Chinese versions of the Cancer Control Supplement Questionnaire used in the 1987 NHIS. Several translators independently produced parallel translations, which were back-translated for verification of accuracy and comprehension of technical terms. Differences in meanings were identified, discussed, and resolved. In-depth probes, think-aloud methods, and focus groups were used to ensure the conceptual equivalence and comprehensibility of the final survey instrument.37 We conducted mock interviews and pretests to finalize the survey instrument using subjects whose sociodemographic characteristics resembled those of Chinatown residents but who resided elsewhere in Chicago. Photographs of tobacco products (type, size, brand) were prepared for use during interviews.
Data Collection
The major Chinese-language newspapers in Chicago provided media publicity about a forthcoming health study. No mention was made of cancer or smoking so as not to taint responses. Letters were mailed out to introduce the project and to explain the random sample selection process, the voluntary nature of survey participation, the confidentiality of the interview, and a phone number to call if householders had questions. Trained interviewers conducted the survey in Chinese at each respondent's home after written informed consent was obtained.
Statistical analysis was performed with SAS (SAS Institute Inc, Cary, NC) and SPSS (SPSS Inc, Chicago, Ill). Group differences were compared by
2 test. Multiple logistic regression analysis was performed to evaluate the factors associated with smoking behavior, knowledge, and beliefs in order to take into account the effects of potential confounding variables.
| RESULTS |
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On average, current smokers started smoking at 19 years of age (former smokers at 19.9 years). For current and former smokers combined, the starting age ranged from 7 to 52 years (median = 18.5). The most common reasons given for smoking (multiple responses allowed) were habit (40%), addiction (36%), enjoyment (14%), and social functions (11%). Among the current smokers, 93% had smoked cigarettes regularly for more than 10 years; only 5% had smoked for 10 years or less. About 39% of the smokers reported lighting up a cigarette immediately after awakening, 28% within an hour of awakening, and 25% within 1 to 5 hours of waking up. Marlboro (29.5%) and Viceroy (25.7%), followed by Winston (14.3%) and Kent (12.4%), were the preferred brands; some 4.8% smoked the brand 555 and 3.8% reported having no brand loyalty. Smokers tended to favor nonmentholated (93.3%), filter-tipped (97.1%), and soft-pack (79%) cigarettes. Preference for regular-size cigarettes ran high (83.8%). Most popular were regular cigarettes (61%), followed by light cigarettes (36.2%). Some (44%) smoked half a pack to a pack of cigarettes a day, and 42% smoked less than half a pack a day.
Quitting Attempts
Among current smokers, 47% had made at least one serious attempt to quit; of these, 59% had tried more than once. The most commonly used method for quitting was "cold turkey" (76%), followed by reduced smoking (25%) and using Nicorette, a nonprescription gum used as nicotine replacement therapy (PharmacieAB, Stockholm, Sweden) (14%). Unsuccessful quitting attempts were attributed to addiction (20%), the fact that "others smoke so [they] go along" (18%), and social functions (10%). Forty-eight percent of current smokers claimed that they could quit any time if they really wanted to, but a large percentage (42%) admitted that they could not quit. Nearly half of the current smokers (47.6%) reported having been advised by their doctors to stop smoking.
Contrast Between Never and Current Smokers
Being a current smoker was significantly associated with low level of education, poor spoken English fluency, not using clinics or a Western doctor's office as a usual source of health care, and having no knowledge of even 1 early cancer warning sign or symptom (Table 3
). About 14% of both smokers and never smokers had an immediate family member who had had cancer. Age and years of residence in the United States were not significantly associated with smoking status. Only 27% of smokers owned their homes, compared with 46% of never smokers (data not shown).
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Smoking and Alcohol Use
About 70% of the 125 male never smokers were never drinkers; 12% were former drinkers and 18.4% were current drinkers. Among the 105 current smokers, the corresponding percentages of drinkers were as follows: never, 53.3%; former, 19.1%, current, 27.6% (data not shown). The association between smoking and alcohol use is statistically significant (
22 = 6.436; P < .05).
Knowledge of Smoking and Major Diseases
We asked questions about the association of smoking with 5 major diseases by using a truefalse response format. For 3 diseasesbronchitis, lung cancer, and emphysemamore than three quarters of Chinese men (80%, 78%, and 75%, respectively) knew that smoking is a causal factor. For the other 2 diseasesthroat or mouth cancer and heart diseaseonly about half of the respondents were knowledgeable (52% for throat or mouth cancer and 50% for heart disease). However, knowledge of the association between smoking and throat or mouth cancer, bronchitis, and heart disease by smoking status was not significant (data not shown). For lung cancer and emphysema, knowledge of the disease was significantly associated with the 3 levels of smoking status (current, former, and never). The percentage of those who were aware that smoking causes lung cancer and emphysema was lower among current smokers (69.5% and 71.4%, respectively) than among never smokers (87.2% and 76.8%, respectively), with former smokers showing little variation (75.6% and 76.8%, respectively).
Beliefs About Smoking
We added 2 items to the 5 smoking-belief questions in the NHIS, one designed to capture fatalism and the other to inquire about chewing betel nut. Statistically significant differences in smoking beliefs by smoking status were found only for the following items: (1) "Everything causes cancer, so it does not matter whether one smokes or not" (agreed with by 48% of current smokers, 12% of former smokers, and 13% of never smokers); (2) "Chewing betel nut is harmful to one's health" (27% of current smokers, 29% of former smokers, and 44% of never smokers); (3) "Most deaths from lung cancer are caused by cigarette smoking" (61% of current smokers, 67% of former smokers, and 79% of never smokers).
Useful Sources of Information
When asked to name their most useful sources of health information, the most often mentioned sources were newspapers (34%), books (25%), doctors (23%), magazines (18%), friends (16%), television (14%), family (10%), and radio (5%). Fewer than 2% of Chinese men named pamphlets and workplace. Asked about what location would be most convenient to them if they were to be offered a 2-hour class on how to reduce their chances of getting cancer, 3 of every 5 Chinese men identified the community center, followed by a local school (28%), church (18%), clubs (4%), and home (4%). Only about 2% named another site (e.g., hospital, senior center, workplace).
| DISCUSSION |
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Second, age and cohort effects are confounded in the variation of smoking status by age. Since the overwhelming majority of older Chinese are foreign-born nonEnglish speakers, their smoking prevalence is higher than the rate reported for younger cohorts of English-speaking, mostly US-born, Chinese Americans who respond to BRFSS telephone interviews. Studies with extraordinarily large samples are needed to monitor the smoking prevalence of different age cohorts by nativity.
Third, the following methodological differences between our study and others most likely contributed to the differences in the results: (a) we conducted a population-based survey in Chinatown; (b) we sampled adults aged 40 to 69 years; (c) we met face-to-face, not over the telephone, with interviewees; (d) we interviewed in Chinese languages; (e) our survey instrument was standardizedthe kind and number of explanations provided to the respondents were rehearsed during training.
Clearly, replication studies are very much needed. However, in designing intervention programs, some thought should be given to the immediately controllable factors (source of health care and knowledge of early cancer warning signs and symptoms). Smokers and the community at large can benefit from the establishment of smoking cessation programs in Chinese languages.
Except for the NHIS and the BRFSS, which surveyed mostly English-speaking AAPIs, we have found only 2 population-based studies aimed at estimating tobacco use among Chinese Americans, both conducted in California. 23,29 Given the geographic variability in immigrant compositions, coordinated multisite, large-sample surveys of smoking focused on Chinese Americansthe largest subgroup in the AAPI communityin states or areas where they are most populous is necessary to obtain precise estimates of smoking prevalence, health risks, and health status.
Proclaimed as the single most preventable and controllable factor in morbidity and mortality reduction,39 smoking is one of the important risk factors or causal agents in at least 6 of the top 10 leading causes of death for the nationheart diseases, cancer, cerebrovascular diseases, chronic obstructive pulmonary diseases, diabetes mellitus, and atherosclerosis, which together account for 69.7% of all deaths.40 Among Chinese Americans, heart disease and cancer combined account for 58.3% of all deaths. Cerebrovascular diseases add another 8.4%, bringing the total proportional mortality from tobacco-related deaths for just the 3 leading causes of death up to 66.7%. In the 25- to 64-year age range, cancer is the leading cause of death for Chinese Americans,41 and cancer of the lung and bronchus is the leading cause of cancer deaths for all ages. Hence, even a small decline in smoking prevalence among Chinese Americans will have a significant beneficial public health impact in reducing morbidity and mortality among AAPIs.
| CONCLUSIONS |
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| Acknowledgments |
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We thank P. S. Levy for technical advice on sampling and W. T. Liu for translation assistance. We owe a debt of gratitude to our respondents, bilingual interviewers, project staff, and innumerable community leaders.
| Footnotes |
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Accepted for publication February 23, 2001.
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