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Cancer Causes Control. 2018 Feb;29(2):213-219. doi: 10.1007/s10552-018-1001-8. Epub 2018 Jan 16.

Association between average daily television viewing time and the incidence of ovarian cancer: findings from the Japan Collaborative Cohort Study.

Author information

1
Department of Public Health, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, N15 W7, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan.
2
Department of Public Health, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, N15 W7, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan. tamaa@med.hokudai.ac.jp.
3
Hokkaido Chitose College of Rehabilitation, Hokkaido, Japan.
4
Public Health, Department of Social Medicine, Osaka University Graduate School of Medicine, Osaka, Japan.
5
Department of Hygiene and Public Health, Osaka Medical College, Osaka, Japan.
6
Department of Public Health, Fujita Health University School of Medicine, Aichi, Japan.

Abstract

PURPOSE:

Seventy-five percent of epidemiological studies have reported that sedentary behavior is associated with ovarian cancer incidence. Although Japan has one of the most sedentary populations, with median sitting times of 7 h/day, this association has not been investigated. This study aimed to elucidate the association between average daily television (TV) viewing time, which is a major sedentary behavior, and the incidence of ovarian cancer in a large-scale nationwide cohort study in Japan.

METHODS:

A total of 34,758 female participants aged 40-79 years without a history of cancer at baseline were included in the study. The inverse probability weighted competing risk model was used to calculate the hazard ratio (HR) and 95% confidence interval (CI) for the incidence of ovarian cancer.

RESULTS:

During a median follow-up of 19.4 years, 59 participants developed ovarian cancer (ICD-10: C56), 2,706 participants developed other types of cancer, and 4,318 participants died. Participants who watched TV for ≥ 5 h/day were more likely to develop ovarian cancer than those who watched TV for < 2 h/day (HR 2.15; 95% CI 1.54-2.99).

CONCLUSION:

Our findings suggest that reducing the amount of time spent sedentarily may be beneficial for preventing ovarian cancer.

KEYWORDS:

Cohort study; Epidemiology; Ovarian neoplasms; Risk assessment; Sedentary behavior

PMID:
29340890
DOI:
10.1007/s10552-018-1001-8
[Indexed for MEDLINE]
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