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Table 4 Characteristics of subgroups after 2 years’ follow-up

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

Variables Case group Control group   P-value
Shift (n = 45) Shift controls (n = 67) Non-shift controls (n = 30)
Age (years); mean (SD), range, days 27.4 (3.26), 22–35 28.7 (2.53), 24–34 27.2 (2.86), 23–34 F = 3.60 0.050
BMI (kg/m2); mean (SD), range 19.5 (1.50), 16.8–23.8 20.3(1.75);16.41-23.94 19.7 (2.07), 15.94–24.88 F = 2.78 0.065
Duration of shift work (years); mean (SD), range 5.2 (2.99), 2.5–9.0 6.1 (1.78), 3–10.5 4.2 (1.67), 2.0–8.0 F = 13.3 0.000
Number of night shifts/month; mean (SD), range 3.2 (1.39), 1.0–6.0 3.8 (1.29), 1.5–7.0 –– t = 1.71 0.089
Number of evening shifts/month; mean (SD), range 4.5 (1.23), 2.5–7.5 3.7 (1.45), 1.5–8.0 –– t = 3.08 0.003
Sleep length (hours); mean (SD), range 6.32 (1.47), 5–11 6.18 (1.23), 5–10.5 7.01 (1.65), 5.5–10 F = 7.29 0.01
Standard SDS score; mean (SD), range 37.8 (5.31), 26.0–48.75 36.4 (4.55), 26.25–47.50 35.0 (5.15), 23.75–42.50 F = 3.02 0.052
Perceived job satisfaction; n (%)   
Low 5 (11.1 %) 8 (11.9 %) 0 χ2 = 29.83 0.000
Medium 37 (82.2 %) 54 (80.6 %) 16 (53.3 %)
High 3 (6.7 %) 5 (7.5 %) 14 (46.7 %)