Table 2 Summary of PGLS models of SSD regressed against absolute value of directional change in body size in each sex for four tetrapod clades

Clade	Sex	Directional change	n	Slope	λ	P
Mammals	Female	Decrease	61	−0.153	0.729	0.065
	Female	Increase	81	−0.003	0.717	0.962
	Male	Decrease	77	−0.263	0.480	<0.001
	Male	Increase	75	0.012	0.407	0.851
Birds	Female	Decrease	97	−0.492	0.545	0.251
	Female	Increase	143	−0.018	0.863	0.611
	Male	Decrease	101	−0.043	0.870	0.210
	Male	Increase	140	−0.053	0.858	0.113
Squamates	Female	Decrease	152	0.066	0.181	0.292
	Female	Increase	150	−0.005	0.227	0.943
	Male	Decrease	138	0.101	0.187	0.125
	Male	Increase	166	−0.096	0.179	0.112
Amphibians	Female	Decrease	144	0.101	0.518	0.134
	Female	Increase	129	0.076	0.843	0.422
	Male	Decrease	139	0.035	0.439	0.582
	Male	Increase	147	−0.235	−0.014	0.003

The columns show the sample sizes, estimated slopes, λ values and the P values of the slope. Statistically significant slopes are in bold.

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