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Table 2 Menstrual patterns of nurses in non-shift (n = 139) and shift (n = 334) groups

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

Before After
Variables Group χ 2 P-value Group χ 2 P-value
  Non-shift Shift    Non-shift Shift   
Dysmenorrhea 92 (66.2) 171 (51.2) 8.933 0.003 103 (74.1) 204 (61.1) -- 0.01*
 Mild 53 (38.1) 82 (24.6) 4.651 0.098 61 (43.9) 22 (6.6) 81.458 0.000
 Moderate 27 (19.4) 73 (21.9) 32 (23.0) 135 (40.4)
 Heavy 12 (8.6) 16 (4.8) 10 (7.2) 47 (14.1)
Irregular menstrual cycle 13 (9.7) 52 (16.6) 3.562 0.059 20 (14.9) 78 (24.8) 5.403 0.020
Regular menstrual cycle  
  ≤ 24 days 10 (8.3) 10 (3.8) 4.470 0.107 14 (12.3) 26 (11.0) 7.119 0.028
 25–31 days 99 (81.8) 214 (81.7) 89 (78.1) 160 (67.8)
  ≥ 32 days 12 (9.9) 38 (14.5) 11 (9.6) 50 (21.2)
Amount of flow  
 Hypomenorrhea/reduction 12 (8.6) 42 (12.4) 4.686 0.096 10 (7.2) 42 (12.6) 17.376 0.000
 Moderate/No changes 118 (84.9) 254 (76.0) 116 (83.5) 215 (64.4)
 Heavy/increase 9 (6.5) 38 (11.4) 13 (9.6) 77 (35.8)
 Bleeding during menstrual cycle 3 (2.2) 8 (2.4) 0.024 0.876 9 (6.5) 37 (11.1) 2.669 0.124
  1. Variables are n (%)
  2. *As a statistical difference had been found in dysmenorrhea between shift and non-shift groups, the dysmenorrhea rate was only compared in the shift group before and after the change to shift work