Table 1

Demographic and menstrual characteristics according to the severity of dysmenorrhoea

VariablesDysmenorrhoea (n (%) or (mean±SD))P value
No (486)Mild (574)Moderate-to-severe (92)
Age (years)29.9±3.529.2±3.028.4±2.4<0.001
BMI (kg/m2)21.2±2.920.9±2.520.3±3.00.021
Race0.733
 Han474 (42.2)559 (49.8)89 (7.9)
 Others12 (40.0)15 (50.0)3 (10.0)
Education0.533
 Junior college96 (42.7)113 (50.2)16 (7.1)
 Undergraduate302 (43.0)346 (49.2)55 (7.8)
 Graduate88 (39.3)115 (51.3)21 (9.4)
Home income0.646
 <¥100K31 (36.9)48 (57.1)5 (6.0)
 ¥100K–¥150K77 (41.4)96 (51.6)13 (7.0)
 ≥¥150K357 (43.9)392 (48.2)65 (8.0)
Personal income0.622
 <¥100K241 (40.3)315 (52.7)42 (7.0)
 ¥100K–¥150K159 (45.2)161 (45.7)32 (9.1)
 ≥¥150K62 (43.7)68 (47.9)12 (8.5)
Onset of menarche (years)13.4±1.413.4±1.313.4±1.30.763
Length of menstrual cycle (days)29.8±2.929.7±2.930.3±7.70.308
Bleeding duration (days/month)5.6±1.45.7±1.25.7±1.30.268
Volume of menstrual flow<0.001
 Light48 (48.0)44 (44.0)8 (8.0)
 Normal419 (43.2)487 (50.2)65 (6.7)
 Heavy18 (23.1)41 (52.6)19 (24.4)
Regularity of menstrual cycle0.773
 Regular393 (41.7)479 (50.8)71 (7.5)
 Irregular93 (44.5)95 (45.5)21 (10.0)
Having had a pregnancy<0.001
 No244 (37.2)344 (52.4)68 (10.4)
 Yes241 (48.7)230 (46.5)24 (4.8)
  • P value was obtained by Kruskal-Wallis test for categorical variables and one-way analysis of variance for continuous variables.

  • BMI, body mass index.