From: Night-shift work duration and breast cancer risk: an updated systematic review and meta-analysis
Author | Total size/cases sample size | Follow up length (years) | Exposure data source | Adjusted confounders | Definition of night shift | NSW category | Quality score (%) |
---|---|---|---|---|---|---|---|
Koppes [72] | 285,723/2531 | 7 | Labor Force Survey | Age, origin, children in the household, education, occupational group, contractual working hours, and job tenure | Work at nights, meaning between midnight and 6 am | Short/long | High |
Pronk et al. [74] | 73,049/717 | 9 | In-person occupational history plus job exposure matrix | Age, age at first childbirth, parity, family history, education, work-related PA | Starting work after 10 PM at least 3 times a month for over 1Â year | Short/long | High |
Ã…kerstedt et al. [70] | 13,656/463 | 12 | Swedish Twin registry, with follow-up in the Swedish Cancer Registry | Age, education, parity, Tobacco use, BMI, PA, Alcohol consumption, coffee consumption, menopause status, hormone use, previous cancer, time to BC diagnosis | Working hours in nights at least now and then | Short/long | High |
Wegrzyn [73] | 78,516/5971 | 24 | Nurses’ Health Study | Age, height, current BMI and BMI at age 18 years, adolescent body size, age at menarche and at first birth, parity, BF history, type of menopause, age at menopause, MHT use, duration of use of estrogen-only MHT, duration of use of combined estrogen and progesterone MHT, first-degree family history of BC, history of benign breast disease, alcohol consumption, PA level, and current mammography use | At least 3 nights/month in addition to days/evenings in that month | Short/long | High |
Wegrzyn [73] | 114,559/3570 | 24 | Nurses’ Health Study II | Age, height, current BMI and BMI at age 18 years, adolescent body size, age at menarche and at first birth, parity, BF history, type of menopause, age at menopause, MHT use, duration of use of estrogen-only MHT, duration of use of combined estrogen and progesterone MHT, first-degree family history of BC, history of benign breast disease, alcohol consumption, PA level, and current mammography use | At least 3 nights/month in addition to days/evenings in that month | Short/long | High |
Jones et al. [71] | 102,869/2059 | 9.5 | Generations Study | Alcohol use, parity, OC use, MHT use, and menopausal status | Any jobs that regularly involved work in the late evening or night (between 10Â pm and 7 am) | Short/long | Moderate |
Travis et al. [28] | 522 246/ 4809 | Established 1996 to 2001. Analyzed at December 2013 | Million woman study | Age, SES, marital status, nulliparity, age at first birth, number of children, obesity, PA, alcohol consumption, smoking, first-degree relative with BC, OC use, MHT use, amount of sleep, take medication to sleep, more evening than morning type | Any time between midnight and 06:00Â h, for at least 3 nights per month | Short/long | High |
Travis et al. [28] | 22,559/181 | Recruited 1993–1999. Analyzed at December 2013 | EPIC-Oxford study | Age, SES, marital status, nulliparity, age at first birth, number of children, obesity, PA, alcohol consumption, smoking, first-degree relative with BC, OC use, MHT use, amount of sleep, take medication to sleep, more evening than morning type | Any job lasting for at least one year, and occurring on a regular basis for at least one night per month or 12 nights per year | Ever/long | High |
Sweeney et al. [75] | 48,451/3191 | Recruited 2003–2009. Analyzed at September 2017 | Sister study cohort | Age, race/ethnicity, education, marital status and parity | 1 h between 12:00 and 2:00 AM) for ≥ 2 years | Short/long | High |