Table 2.

Results of linear mixed models (LMMs) on the effects of ClkpolyQ length, body mass, sex, and year, on peak date deviation (PD) of plasma luteinizing hormone (LH), and on the PDs of plasma testosterone (T) and estradiol (E₂), of wild-caught, captive, Asian short-toed larks in Inner Mongolia, China.

Response variable	Explanatory variable	F	P
PD of LH	ClkpolyQ length	15.907	<0.001
	body mass	0.509	0.826
	sex	0.888	0.348
	year	0.535	0.846
	ClkpolyQ length × body mass	0.535	0.846
	ClkpolyQ length × sex	1.819	0.167
	ClkpolyQ length × year	1.648	0.154
PD of T	ClkpolyQ length	3.333	0.042
	body mass	1.942	0.079
	year	0.982	0.473
	ClkpolyQ length × body mass	1.562	0.132
	ClkpolyQ length × year	0.971	0.516
PD of E2	ClkpolyQ length	4.482	0.021
	body mass	0.332	0.914
	year	1.025	0.431
	ClkpolyQ length × body mass	1.459	0.263
	ClkpolyQ length × year	1.042	0.348