Table 6—

Bivariate correlations for hypercapnic response(minute ventilation/end-tidal carbon dioxide tension (P_ET,CO₂))

Variable	Whole sample		Males		Females
	Rho	p-value	Rho	p-value	Pre-menopausal		Post-menopausal
	Rho	p-value	Rho	p-value	Rho	p-value	Rho	p-value
Height	0.393	<0.001	0.309	0.004	0.242	0.018	0.009	0.950
Age	-0.134	0.036	0.003	0.978	-0.190	0.066	-0.049	0.737
% body fat	-0.289	<0.001	0.038	0.739	-0.122	0.247	-0.118	0.439
Leptin	-0.191	0.003	0.026	0.813	0.025	0.810	0.002	0.987
Log leptin	-0.191	0.003	0.026	0.813	0.025	0.810	0.002	0.987
Leptin^#	-0.068	0.308	-0.083	0.476	0.070	0.512	0.022	0.887
Log leptin^#	-0.098	0.141	-0.142	0.217	0.077	0.466	0.031	0.844
Log leptin/% body fat	0.104	0.119	-0.085	0.464	0.137	0.200	0.184	0.231
Waist	0.042	0.513	0.162	0.142	-0.207	0.046	-0.175	0.234
Waist–hip ratio	0.168	0.009	0.041	0.709	-0.089	0.394	0.063	0.669
TLC % pred	-0.019	0.773	-0.002	0.984	0.113	0.279	0.345	0.015
P_ET,CO₂	0.000	0.996	-0.109	0.319	0.043	0.681	-0.247	0.087
AHI	0.122	0.082	0.072	0.562	0.013	0.909	-0.003	0.984
S_p,min	0.075	0.284	-0.053	0.669	0.281	0.010	0.238	0.145
S_p,med	0.034	0.634	-0.159	0.202	0.250	0.022	0.222	0.175
Sex	0.364	<0.001

TLC: total lung capacity; % pred: % predicted; AHI: apnoea/hypopnoea index; S_p,min: minimal nocturnal arterial oxygen saturation (S_p,O₂); S_p,med: mean nocturnal S_p,O₂. ^#: bivariate correlations adjusted by % body fat.