Table 2.

Measures of sleep of the analytic sample at baseline and 1-y follow-up.

Sleep Characteristic	Baseline	1-y Follow-Up	p-Value
Total PSQI score a	5.5 ± 3.6	5.1 ± 3.3	<0.01
Sleep onset latency (min) b	24.3 ± 29.3	21.2 ± 21.0	0.02
Sleep efficiency (%) b	88.3 ± 11.4	87.5 ± 11.3	0.24
Sleep disturbance score b	6.1 ± 4.4	5.8 ± 4.2	0.05

^a Possible range of scores is 0–21, with higher scores indicating poorer sleep quality. ^b Component of the Pittsburgh Sleep Quality Index (PSQI) calculated using scoring instructions from the original manuscript.