. 2014 Mar 10;9(3):e90923. doi: 10.1371/journal.pone.0090923

Table 3. Average cooperation based on gender of opponent.^* .

Sample	N		Gender of matched counterpart
		Boys	Girls	Difference	Null^**	p-value
Colombia	219/239	4.41	3.63	0.78	H₀: MB = MG	0.0543
Boys vs.	115/103	4.69	4.20	0.49	H₀: MB = MG	0.2089
Girls vs.	99/127	4.17	3.06	1.11	H₀: MB = MG	0.1416
Sweden	182/179	4.51	4.03	0.48	H₀: MB = MG	0.1374
Boys vs.	82/97	4.30	3.78	0.52	H₀: MB = MG	0.2331
Girls vs.	100/81	4.67	4.38	0.29	H₀: MB = MG	0.5128

The rows indicate within which sample the test is conducted, and the third and fourth columns indicate the gender of the matched counterpart.

*We lack information about the gender of the opponent for four participants.

** H₀: B = G refers to the null-hypothesis of no differences in cooperation between being randomly matched with a Boy (MB) and being randomly matched with Girl (MG) with the respective samples.

Table 3. Average cooperation based on gender of opponent.* .

Table 3. Average cooperation based on gender of opponent.^* .