Table 4—

Unadjusted Pearson’s correlation

	Age yrs	BMI kg·m⁻²	Neck circ. cm	OSA-RS 0–3
Males^#
BMI kg·m⁻²	0.34^§
Neck circ. cm	0.32^§	0.71^§
OSA-RS 0–3	0.55^§	0.54^§	0.53^§
P_critcmH₂O	0.37^§	0.27***	0.31^§	0.34^§
Females^¶
BMI kg·m⁻²	0.32^§
Neck circ. cm	0.12^§	0.64^§
OSA-RS 0–3	0.57^§	0.47^§	0.28⁺
P_critcmH₂O	0.40^§	0.10	0.09	0.37^§

BMI: body mass index; circ.: circumference; OSA-RS: obstructive sleep apnoea risk score; P_crit: critical value of positive end-expiratory pressure. ^#: n = 119; ^¶: n = 108; ⁺: p<0.002. ***: p<0.001; ^§: p<0.0001.