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. 2009 May 18;4(5):e5591. doi: 10.1371/journal.pone.0005591

Table 6. Summary relative risk (RR) estimates and 95% confidence intervals (CIs) for seven case-control studies of the association between subfertility and testicular cancer incidence.

Subgroup	Studies (No.)	Summary RR (95% CI)	Between Studies
			Q	P Heterogeneity	I ² Statistics
Case-control studies	7	1.68 (1.22 to 2.3)	8.46	0.21	0.29
Population-based	4	2.15 (1.11 to 4.17)	5.36	0.15	0.44
Hospital-based	3	1.56 (0.93 to 2.61)	3.09	0.21	0.35
Region			0.20^*	0.66
United States	4	1.75 (1.01 to 3.02)	6.61	0.09	0.55
Europe	3	1.53 (1.22 to 1.92)	1.66	0.44	0.20
Excluded cryptorchidism	5	1.59 (1.28 to 1.98)	3.63	0.46	0.10

^*

for between subgroup.