Biomedical subjects

C Anderson Johnson

Publications and source records attributed to C Anderson Johnson.

43 records · Page 3Linked to original sources

PubMed2003

Effects of a social-network method for group assignment strategies on peer-led tobacco prevention programs in schools.

OBJECTIVES: Our study tested the effectiveness of network methods for identifying opinion leaders and for constructing groups. METHODS: Three conditions-random, teacher, and network--ere randomly assigned to 84 6th-grade classrooms within 16 schools. Pre- and postcurriculum data on mediators of tobacco use were collected from 1961 students. Peer leaders in the network condition were identified by student nominations, and those leaders were matched with the students who nominated them. RESULTS: Students in the network condition relative to the random condition liked the prevention program more and had improved attitudes (beta = -0.06; P <.01), improved self-efficacy (beta = -0.10; P <.001), and decreased intention to smoke (adjusted odds ratio [OR] = 0.46; 95% confidence interval [CI] = 0.38, 0.55). CONCLUSIONS: The network method was the most effective way to structure the program. Future programs may refine this technique and use it in other settings.

Child↗

PubMed2003

Secular trends in adolescent never smoking from 1990 to 1999 in California: an age-period-cohort analysis.

OBJECTIVES: We analyzed age, time period, and cohort effects on trends in adolescent cigarette smoking in California from 1990 to 1999. METHODS: Data from subjects aged 12 to 17 years (n = 26 536; 50.4% male) from the California Tobacco Survey and the California Youth Tobacco Survey were analyzed, and never smokers were used as the outcome measure. RESULTS: The proportion of never smokers increased from 60% for males and 66% for females in 1990 to around 70% for both sexes in 1999. Respondents were more likely to be never smokers if born in 1978 or later (i.e., aged 12 years or younger in 1990, when most tobacco control programs started in California). CONCLUSIONS: The statewide antitobacco programs prevented adolescents from starting to smoke, primarily through a cohort effect.

Adolescent↗

PubMed2002

Peer influences and access to cigarettes as correlates of adolescent smoking: a cross-cultural comparison of Wuhan, China, and California.

BACKGROUND: Few studies have assessed the effects of access to cigarettes and peer influences on adolescent smoking in non-Western countries. Using samples characterized by two distinct cultural, social, and economic systems, this study evaluated the associations of friends' smoking and perceived access to cigarettes with adolescent smoking behavior in California and Wuhan, China. METHODS: Survey data were obtained from 5870 eighth-grade students in the Independent Evaluation of the California Tobacco Control Program and 6992 seventh- to ninth-grade students in the Wuhan Smoking Prevention Trial. Odds ratios for lifetime and 30-day smoking, according to friends' smoking and perceived access to cigarettes, were calculated for boys and girls in both samples and compared. RESULTS: California students were more likely than Wuhan students to have friends who smoked and to perceive easy access to cigarettes. The smoking prevalence was lower in Wuhan than in California, mainly due to the low smoking prevalence among Wuhan girls. Friends' smoking was strongly associated with smoking in both samples, and the strength of this association did not differ between the two cultures. Access to cigarettes was associated with a higher risk of lifetime smoking in both cultures and a higher risk of past 30-day smoking in California only. CONCLUSIONS: Despite divergent tobacco control policy enforcement, social structures, and cultural contexts, similarities exist between Wuhan and California. The findings suggest support for adapting a social-influences-based smoking prevention program developed in the United States to the culturally specific needs of youth in Wuhan, China.

Adolescent↗

PubMed2002

Independent evaluation of the California Tobacco Control Program: relationships between program exposure and outcomes, 1996-1998.

OBJECTIVES: This study sought to determine the effects of the California Tobacco Control Program on tobacco-related attitudes and behaviors. METHODS: In 1996 and 1998, a telephone survey was conducted among adults in randomly selected households in 18 California counties. Tenth-grade youths in 84 randomly selected high schools completed a written survey. In analyses conducted at the county level, differences in outcomes were regressed on an index of program exposure. RESULTS: Among adults, program exposure was associated with decreased smoking prevalence rates, increased no-smoking policies in homes, and decreased violations of workplace no-smoking policies. Among youths, there was no effect of program exposure on outcomes. CONCLUSIONS: These results suggest that the California Tobacco Control Program may have reduced adult smoking prevalence rates and exposure to environmental tobacco smoke.

Adolescent↗

PubMed2001

Adolescent smoking in Wuhan, China: baseline data from the Wuhan Smoking Prevention Trial.

BACKGROUND: This study reports the prevalence of adolescent smoking in the urban and rural areas of Wuhan, China, the capital of Hubei Province, on the Yangtze River in central China. METHODS: Smoking behavior was examined by age, gender, and urbanicity as part of the Wuhan Smoking Prevention Trial. Subjects included 6994 seventh- to ninth-grade students attending 22 randomly selected schools in urban and rural districts. Outcome measures included lifetime smoking, past-30-day smoking, established smoking (>100 cigarettes in lifetime), and susceptibility to smoking (absence of a firm commitment not to smoke). RESULTS: Lifetime smoking prevalence was 47% among boys and 18% among girls. Past-30-day smoking prevalence was 16% among boys and 4% among girls. Established smoking prevalence was 2% among boys and 0% among girls. The prevalence of susceptibility to smoking was 31% among boys and 10% among girls. Smoking increased significantly with age (p<.0005). Susceptibility was more prevalent in rural areas than in urban areas (p<.05), but there were no urban-rural differences in lifetime, past 30-day smoking, or established smoking. Trend analyses revealed that smoking increased with age more rapidly among boys than among girls (p<.05). Smoking was more prevalent among rural boys than among urban boys, but it was more prevalent among urban girls than among rural girls (p<.05). CONCLUSIONS: Adolescent smoking is a significant public health problem in China. Boys are at particularly high risk, as are girls living in urban areas. Effective smoking prevention programs for adolescents, as well as restrictions on tobacco industry marketing and youth access to tobacco, are needed to prevent tobacco-related morbidity and mortality in China.

Adolescent↗

PubMedDate not supplied

Smoking among adolescents in China: an analysis based upon the meanings of smoking theory.

PURPOSE: This study utilized the Meanings of Behavior theory to examine whether meanings of smoking differ among adolescents in China who were never smokers, ever smokers, and past-30-day smokers. The Meanings of Behavior theory argues that affect takes precedence over cognitive constructs in motivating behavior This study also examined whether the associations among meanings of smoking and smoking behavior vary by age and gender DESIGN: This study was a cross-sectional study using survey data. SETTING: Middle and high schools in seven cities in China. SUBJECTS: A random sample of 4724 students comprised this study. MEASURE: A self-administered questionnaire asked about smoking behavior and incorporated the meanings of smoking scale. RESULTS: Overall prevalence rates of ever smokers and past-30-day smokers in this sample were 24.3% and 9.0%. Smoking was much more prevalent in boys than in girls. Students in the 11th grade were more likely than those in the 7th grade to have tried smoking at some time and to have smoked within the past 30 days. Odds ratios confirmed that meanings of smoking were significantly associated with smoking behaviors. CONCLUSIONS: Meanings of smoking are associated with smoking behavior among Chinese adolescents in that smoking may connote autonomy, control, or social relatedness. Prevention programs in China require new strategies to incorporate meanings of smoking in order to meet adolescent psychological needs for autonomy, competence, and social connections.

Adolescent↗

PubMedDate not supplied

Weight perception, academic performance, and psychological factors in Chinese adolescents.

OBJECTIVE: To investigate weight perception and related psychological factors in Chinese adolescents. METHODS: A questionnaire on weight perception, academic performance, stress, hostility, and depression was completed by 6863 middle and high school students. Weight and height were measured. RESULTS: Overweight perception was related to school-related stress and depression in both girls and boys (P<0.01) and to hostility in boys (P<0.01). Perceived over-weight was related to lower GPA in girls only (P<0.05). CONCLUSIONS: Distorted weight perception has a detrimental psychological impact on Chinese adolescents. These findings may contribute to the obesity research and to the development of future effective intervention programs in China.

Achievement↗