Table 3.

Sleep quality stratified by OPAS-C quartile.

OPAS-C Quartile	Mean (95% confidence intervals)
	PSQI raw score	Proportion of respondents meeting cutoff criteria for poor sleep quality*
Quartile 1	6.45 (5.93, 6.96)	0.54 (0.46, 0.63)
Quartile 2	7.08 (6.43, 7.73)	0.59 (0.50, 0.68)
Quartile 3	7.80 (7.28, 8.33)	0.78 (0.71, 0.86)
Quartile 4	9.35 (8.66, 10.04)	0.85 (0.79, 0.92)

^*Defined as PSQI>5.