Table 3.

Pooled OR (OR) and 95% (CI) of premenstrual syndrome and high intake of alcohol

	Number of studies	OR (95% CI) Fixed effects	OR (95% CI) Random effects	Ri*	Q test P values
All studies	13	1.71 (1.63 to 1.78)	1.79 (1.39 to 2.32)	0.96	0.0001
Case-control studies	5	1.27 (1.10 to 1.47)	2.48 (1.30 to 4.76)	0.93	0.0001
Cross-sectional studies	7	2.02 (1.91 to 2.12)	1.76 (1.32 to 2.36)	0.95	0.0001
Direct calculations	12	1.91 (1.82 to 2.01)	1.90 (1.45 to 2.49)	0.95	0.0001
Quality score ≥3	8	1.20 (1.11 to 1.29)	1.41 (1.14 to 1.74)	0.81	0.001
Quality score <3	5	2.05 (1.95 to 2.16)	2.33 (1.60 to 3.41)	0.96	0.0001
Full adjustment	6	1.17 (1.08 to 1.26)	1.23 (1.03 to 1.48)	0.72	0.03
Incomplete adjustment	7	2.05 (1.95 to 2.16)	2.25 (1.66 to 3.05)	0.95	0.0001
Validated exposure	7	1.18 (1.09 to 1.27)	1.32 (1.06 to 1.64)	0.81	0.003
Non validated exposure	6	2.06 (1.95 to 2.17)	2.25 (1.66 to 3.06)	0.95	0.0004
Validated diagnosis	7	1.95 (1.85 to 2.06)	1.98 (1.31 to 3.00)	0.98	0.0001
Non validated diagnosis	6	1.26 (1.16 to 1.36)	1.58 (1.22 to 2.05)	0.86	0.001
High response rate	4	1.23 (1.06 to 1.42)	1.84 (1.07 to 3.17)	0.91	0.001
Low response rate	9	1.76 (1.68 to 1.84)	1.80 (1.32 to 2.47)	0.97	0.0001
Defined target population	8	1.23 (1.15 to 1.32)	1.45 (1.21 to 1.75)	0.78	0.001
Undefined target population	5	2.09 (1.98 to 2.21)	2.49 (1.36 to 4.58)	0.99	0.0001
US studies	9	1.92 (1.83 to 2.02)	1.91 (1.41 to 2.59)	0.96	0.0001
Rest of the world	4	1.19 (1.09 to 1.30)	1.58 (0.95 to 2.63)	0.96	0.001

*Proportion of total variance due to between-study variance.