Table 1

Comparison of demographic and menstruation characteristics between the dysmenorrhoea and non-dysmenorrhoea groups

Variable	Dysmenorrhoeal group (n=297)		Non-dysmenorrhoeal group (n=123)		t or χ²	P value
Variable	n	%	n	%	t or χ²	P value
Age (years) (mean±SD)	30.33±3.61		32.04±4.47		−3.78	<0.001
Age <40	292	98.32	115	93.50	6.74	<0.01
Age ≥40	5	1.68	8	6.50
Marital status					20.03	<0.001
Unmarried	231	77.78	69	56.10
Married	66	22.22	54	43.90
Childbearing					19.38	<0.001
No	247	83.16	78	63.41
Yes	50	16.84	45	36.59
Age of menarche (years)					4.70	0.030
>12	46	15.49	11	8.94
≥12	251	84.51	112	91.06
Regularity of menstrual cycle					0.10	0.755
Yes	193	64.98	85	69.11
No	104	35.02	38	30.89
Duration of menstrual cycle (days)					1.99	0.575
≤4	110	37.04	43	34.96
5–6	157	52.86	70	56.91
≥7	30	10.10	10	8.13
Prior health education on dysmenorrhoea					0.99	0.321
No	163	54.88	74	60.16
Yes	134	45.12	49	39.84
Three shift rotation					6.06	0.014
Yes	271	91.25	102	82.93
No	26	8.75	21	17.07
Do you know you can ask for menstrual leave?					2.03	0.154
Yes	242	81.48	107	86.99
No	55	18.52	16	13.01
Do you consider menstrual leave necessary?					1.68	0.195
Yes	288	96.97	115	93.50
No	9	3.03	8	6.50
Have you ever asked for menstrual leave?					0.14	0.707
No	272	91.58	114	92.68
Yes	25	8.42	9	7.32
Have you ever asked for more leave for dysmenorrhoea?					3.59	0.058
No	262	88.22	116	94.31
Yes	35	11.78	7	5.69
Secondary dysmenorrhoea					0.02	0.886
No	267	89.90	110	89.43
Yes	30	10.10	13	10.57

Note, regularity of periods indicates that the duration between consecutive first day menses is similar.