Table 2

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

Number of studiesOR (95% CI) Fixed effectsOR (95% CI) Random effectsRi*Q test P values
All studies191.31 (1.28 to 1.35)1.45 (1.17 to 1.79)0.980.0001
Case-control studies71.27 (1.14 to 1.41)1.66 (1.04 to 2.64)0.930.0001
Cross-sectional studies111.67 (1.60 to 1.74)1.40 (1.00 to 1.94)0.980.0001
Direct calculations171.31 (1.28 to 1.35)1.51 (1.22 to 1.88)0.980.0001
Quality score ≥3101.11 (1.07 to 1.14)1.22 (1.05 to 1.42)0.900.0003
Quality score <391.73 (1.66 to 1.80)1.50 (1.03 to 2.20)0.980.0001
Full adjustment71.10 (1.07 to 1.14)1.18 (1.01 to 1.38)0.900.005
Incomplete adjustment121.70 (1.63 to 1.77)1.47 (1.07 to 2.03)0.980.0001
Validated exposure111.09 (1.05 to 1.12)1.09 (0.99 to 1.20)0.770.006
Non validated exposure82.06 (1.96 to 2.16)1.91 (1.40 to 2.62)0.960.0001
Validated diagnosis121.85 (1.77 to 1.94)1.38 (0.99 to 1.92)0.970.0001
Non validated diagnosis71.10 (1.07 to 1.14)1.38 (1.16 to 1.65)0.950.0001
High response rate51.16 (1.05 to 1.28)1.36 (0.99 to 1.88)0.860.003
Low response rate141.32 (1.29 to 1.36)1.46 (1.13 to 1.89)0.980.0001
Defined target population121.10 (1.07 to 1.13)1.20 (1.07 to 1.36)0.860.0001
Undefined target population72.05 (1.95 to 2.15)1.65 (1.02 to 2.67)0.990.0001
US studies121.63 (1.57 to 1.70)1.56 (1.17 to 2.08)0.980.0001
Rest of the world71.10 (1.06 to 1.14)1.24 (0.89 to 1.72)0.980.0001
  • *Proportion of total variance due to between-study variance.