A Longitudinal Examination of the Relation Between Internalizing Problem Behaviors and Early Adolescent Cigarette Smoking.

OBJECTIVE: The purpose of the present study was to investigate the longitudinal relation between internalizing problem behaviors (measured with the anxious/depressed and somatic complaints subscales of the Achenbach Teacher's Report Form) and self-reported cigarette smoking behavior and intentions during early adolescence. In addition, a possible mediating role of perceived harm was investigated. METHODS: Sixth graders and their teachers were surveyed in the sixth grade and students were surveyed again in the seventh grade. Smoking behavior and intentions were assessed with five items including lifetime use, 30-day use, tobacco user status (nonsmoker to heavy smoker), and two intentions/behavioral expectations items. In addition to perceived harm from smoking, reasons for smoking and reasons for not smoking were included on the survey. RESULTS: As hypothesized, teacher reports of sixth-grade internalizing problem behaviors were negatively related to seventh-grade smoking behavior and intentions. Moreover, perceived harm from smoking was negatively related to smoking and intentions. The hypothesized mediating role of perceived harm in the internalizing to smoking relationship was not supported. CONCLUSIONS: Potential differences in the relation between internalizing and smoking across adolescence are discussed. Specifically, the results of the present study and an examination of prior literature suggest that in early adolescence internalizing problems are negatively related to cigarette smoking, whereas in middle and late adolescence the opposite is true.

The effect of organohalogen contaminants on western Steller sea lion survival and movement in the Russian Far East.

The western stock of Steller sea lions (Eumetopias jubatus) have experienced dramatic declines since the 1960s, particularly in the western Alaskan and Asian portions, which have continued to decline or stabilized at low levels. Multiple causes for this decline have been proposed and may include anthropogenic contamination from organohalogen contaminants (OCs). These include polychlorinated biphenyls (PCBs) and dichlorodiphenyltrichloroethane (DDT), which have not been ruled out as a potential cause for the lack of recovery. The objective of this study was to determine the effects of OCs on survival and movement probabilities estimated in program MARK using resighting data collected from 2003 to 2009. PCBs and DDTs were measured in whole blood from 136 (74 males and 62 females) individually marked, free-ranging pups from four Russian Far East rookeries. The mean concentration of ∑PCB and ∑DDT was 4.25±5.12 and 3.22±4.28 ng g(-1) ww (n=136), respectively, and the average ∑PCB and ∑DDT concentration for those above the aggregate mean (n=44) was 9.25±6.55 and 7.65±5.21 ng g(-1) ww, and those below the aggregate mean (n=92) the concentration was 1.86±0.89 and 1.11±0.65 ng g(-1) ww, respectively. The lowest estimated probabilities of survival occurred in the first year, ranging from 38% to 74%, but increased for ages 1-9, ranging from 82% to 94%. The greatest movement occurred from Medny Island west toward the Kamchatka Peninsula (33%) and to Bering Island (18%), and low movement estimates for other natal rookeries was largely due to minimal resighting effort. The estimated probabilities of resighting varied by location (48%-87%), but had greater precision than survival or movement parameters. Survival and movement were most affected by age and location rather than OCs.

Using Peer Injunctive Norms to Predict Early Adolescent Cigarette Smoking Intentions.

The present study investigated the importance of the perceived injunctive norm to predict early adolescent cigarette smoking intentions. A total of 271 6th graders completed a survey that included perceived prevalence of friend smoking (descriptive norm), perceptions of friends' disapproval of smoking (injunctive norm), and future smoking intentions. Participants also listed their five best friends, in which the actual injunctive norm was calculated. Results showed that smoking intentions were significantly correlated with the perceived injunctive norm but not with the actual injunctive norm. Secondly, the perceived injunctive norm predicted an additional 3.4% of variance in smoking intentions above and beyond the perceived descriptive norm. These results demonstrate the importance of the perceived injunctive norm in predicting early adolescent smoking intentions.