Table 2 Correlates (r) of 6-month fall in 24 hMBP (bivariate analysis)

	Correlation coefficient (r)	95% CI	p Value
Baseline ESS	−0.23	−0.002 to −0.44	0.045
Change in ESS	0.39	0.18 to 0.57	<0.001
Baseline 24 hMBP	−0.60	−0.43 to −0.73	<0.001
Time below Sao₂ 90%	−0.25	−0.02 to −0.45	0.047
Baseline BMI	−0.39	−0.18 to −0.57	<0.001
Baseline waist/height ratio	−0.37	−0.16 to −0.55	<0.001
Change in pulse rate	0.44	0.24 to 0.61	<0.001
Compliance	−0.04	−0.26 to 0.19	0.75
Change in caffeine consumption	−0.002	−0.25 to 0.21	0.86

BMI, body mass index; ESS, Epworth Sleepiness Score; 24 hMBP, mean 24 h blood pressure; Sao₂, arterial oxygen saturation.