Pirjo Liisa Lindfors

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BACKGROUND The aim of the study was to examine the construct validity of the Three-Factor Eating Questionnaire -R18 (TFEQ-R18), a measure of eating behaviour, and to evaluate cognitive restraint, uncontrolled eating and emotional eating in a sample of adolescent and young adult females of different weights. METHODS Subjects were 2 997 females, aged 17 to(More)
BACKGROUND A wide range of electronic cigarettes (e-cigarettes) are now on the market. We studied e-cigarette awareness and use, determinants and sources of e-cigarettes, the e-liquids used in them and exposure to e-cigarette advertisements among adolescents in Finland. Among smokers, we studied the association of e-cigarette use and interest in smoking(More)
BACKGROUND We aimed to develop and evaluate the effectiveness of an individualized, long-term support lifestyle counseling approach in promoting healthy physical activity, improving dietary and sleeping behaviors, and preventing weight gain in young females. The counseling approach's intensity was designed to be low enough to be implementable in primary(More)
OBJECTIVES Wireless and mobile phone technology as a method of data collection will increase alongside conventional methods. The aim of the present study was to evaluate the use of a mobile phone application for recording symptoms and physical activity exertion during an experimental physical exercise study. MATERIALS AND METHODS An experimental study on(More)
We examined how Finnish adolescents' fears for their future changed over a quarter of a century and how these changes reflect transformations of the adolescents' key contexts from the late-modernist perspective. Nationally representative samples of 12-, 14-, 16-, and 18-year-olds in 1983, 1997, and 2007 were surveyed using mailed questionnaires regarding(More)
We examined whether the occurrence of violence changed among Finnish adolescents between 1999 and 2009. The study was based on the nationwide Adolescent Health and Lifestyle Survey from samples of 12- to 18-year-olds. The number of respondents was 8136 in 1999 and 5516 in 2009. The proportion of adolescents reporting violence was 7.9% in 1999 and 6.2% in(More)
BACKGROUND Studies have shown a relationship between students' health and their academic achievements, but whether health of classmates and schoolmates impacts individual students' school achievement is less known. We studied these effects on students in lower secondary school in Finland. METHODS Students (seventh grade, age 12-13 years, N = 7779, 123(More)
Electronic cigarettes are quite a new potential source of nicotine addiction among youth. More research is needed, particularly on e-liquid use and socioeconomic factors as potential determinants. We studied changes from 2013 to 2015 in adolescent e-cigarette awareness and ever-use, types of e-liquids, and determinants in Finland. In 2015, we studied weekly(More)
BACKGROUND Cyberbullying, threatening or harassing another via the internet or mobile phones, does not cause physically harm and thus the consequences are less visible. Little research has been performed on the occurrence of cyberbullying among adolescents or the perception of its seriousness. Only a few population-based studies have been published, none of(More)