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Table 3 Age-adjusted association between rotating shift work and menstrual cycle

From: Rotating shift work and menstrual characteristics in a cohort of Chinese nurses

Variables Menstrual cycle length ≤ 24c Menstrual cycle length ≥ 32cb
n = 26 n = 48
OR 95 % CI OR 95 % CI
Shift work duration (months)   
0a 1.00 1.00
1–9 0.88 (0.72–0.91) 1.02 (0.93-1.05)
10–19 1.13 (0.84–1.62) 1.25 (0.94-1.31)
20+ 0.97 (0.83–1.29) 1.08 (0.76-1.47)
Frequency of evening work/month   
0a 1.00 1.00
1–3 0.76 (0.54–1.06) 0.43 (0.35-0.56)
4–6 1.01 (0.92–1.47) 1.26 (0.83-1.57)
7+ 0.92 (0.97–1.25) 1.04 (0.86-1.19)
Frequency of night work/month   
0a 1.00 1.00
1–3 0.76 (0.53–0.92) 0.49 (0.31-0.72)
4–6 1.48 (0.77–1.91) 1.44 (0.69-1.82)
7+ 1.76 (1.32–2.28) 0.91 (0.85-0.98)
Age (years)   
21–30 0.34 (0.29–0.51) 1.27 (1.20-1.34)
31–35 0.60 (0.52–0.93) 1.05 (0.92-1.15)
36–40a 1.00 1.00
41–46 1.76 (1.02–2.04) 0.53 (0.49-0.61)
BMI (kg/m2)   
<18.5 1.22 (0.70-2.36) 1.79 (1.63-1.94)
18.5-24.9a 1.00 1.00
25-29.9 1.06 (0.81-1.74) 1.18 (1.06-1.26)
30-35 2.03 (0.75-3.97) 1.24 (1.09-1.43)
Perceived job satisfaction   
High 0.58 (0.30-0.79) 0.83 (0.67-0.87)
Mediuma 1.00 1.00
Low 2.11 (0.94-3.69) 1.74 (0.94-1.82)
  1. a Reference category;
  2. b Exclusion of women (n = 2) with regular menstruation but cycle length longer than 45 days
  3. c Reference category presented by menstrual cycle length 25–31 days, n = 160