Table 2. Relationship between shift work timing and sleepiness composite score.

	Mean	Std. Error	95% CI Lower	95% CI Upper
Day shift	2.3169	0.0593	2.1983	2.4355
Night shift	2.6111	0.1282	2.3547	2.8675
Mixture of day and night shift	2.2639	0.0906	2.0827	2.4451
Non-shift work	2.2258	0.069	2.0878	2.3638