Table 2.

Study counts of the 10 possible predictors for ED prevalence and P-value for the uni-predictor (or smallest P-value for the uni-predictor dummy variables) in the univariate MA regression analysis

Predictor	Study count, n	Coefficient estimate	95% CI	P-value
Stage	40	0.6210	−0.5253 to 1.7673	0.2883
Continent	40	1.2655	−0.3051 to 2.8362	0.1143
Mean age	40	0.0503	0.0243 to 0.0762	0.0002a
Age range	40	0.0057	−0.0210 to 0.0325	0.6739
ED assessment method	40	1.5236	−0.1845 to 3.2316	0.0804
Cancer site	40	−1.8135	−2.5841 to −1.0429	<0.0001b
Age standard deviation	17	−0.0078	−0.0733 to 0.0576	0.8144
Proportion of patients who underwent radiotherapy	15	1.0584	−1.0225 to 3.1393	0.3188
Proportion of patients with diabetes	12	−3.6361	−19.1360 to 11.8639	0.6457
Proportion of patients who underwent chemotherapy	12	0.1348	−1.9925 to 2.2621	0.9012

^aSignificance code controlling for type I error rate <0.05 and >0.01.

^bSignificance code controlling for type I error rate <0.0001. CI = confidence interval. ED = erectile dysfunction. MA = meta-analysis.