Table 2.

Association between the frequency of PMS among the participants and their demographics (Chi-square test)

	Have PMS (n = 16,079)	PMS Free (n = 5942)	P value
Age			.26
18–25 years	10,408 (72.6%)	3927 (27.4%)
25–30 years	3401 (74.4%)	1169 (25.6%)
30–35 years	2270 (72.8%)	846 (27.2%)
BMI			.000*
Underweight	776 (71.1%)	315 (28.9%)
Normal	9271 (72.3%)	3552 (27.7%)
Over-weight	4195 (73.9%)	1481 (26.1%)
Obese	1837 (75.6%)	594 (24.4%)
Country			.000*
Egypt	7977 (77.7%)	2287 (22.3%)
Jordan	3400 (72.9%)	1265 (27.1%)
Syria	4702 (66.3%)	2390 (33.7%)
Education level			.002*
Below College	1814 (71.5%)	724 (28.5%)
College degree	12,118 (72.9%)	4512 (27.1%)
above college degree	2147 (75.3%)	706 (24.7%)
Marital status			.46
Single or separated	12,187 (72.9%)	4532 (27.1%)
married	3892 (73.4%)	1410 (26.6%)
Job			.000*
Medical Job	4502 (76.1%)	1415 (23.9%)
Office Job	1131 (71.9%)	442 (28.1%)
Service Job	1211 (70.8%)	499 (29.2%)
Business owner	171 (71.8%)	67 (28.2%)
Student	6388 (72.3%)	2445 (27.7%)
Never worked before	2676 (71.4%)	1074 (28.6%)
Number of work hours			.16
Less than 20 h	3906 (73.7%)	1397 (26.3%)
20–40 h	6215 (73%)	2298 (27%)
40–60 h	1152 (73.8%)	409 (26.2%)
More than 60	244 (68.9%)	110 (31.3%)
No current job	4562 (72.5%)	1728 (27.5%)
Number of Pregnancies**			.76
Zero	965 (72.7%)	363 (27.3%)
1	1150 (74.8%)	387 (25.2%)
2	1131 (72.4%)	431 (27.6%)
Three or more	873 (74.2%)	303 (25.8%)
Number of births**			.16
Zero	1262 (71.9%)	494 (28.1%)
1	1158 (74.9%)	389 (25.1%)
2	1124 (73.3%)	409 (26.7%)
Three or more	558 (75%)	186 (25%)

The * indicates statistical significance, ** the number of pregnancies is reported for 5603 participants and the number of births is reported for 5580 participants