Table 4.

Quality assessment scores of selected studies.

Criterion	Atlantis et al., 2006a	Atlantis et al., 2006b	Harma et al., 1988a	Harma et al., 1988b	Kim et al., 2015	Lim et al., 2015	Suni et al., 2016b
1. Was a method of randomization preformed?	Y	Y	Y	Y	Y	Y	Y
2. Was the treatment allocation concealed prior to baseline testing?	N	N	N	N	N	N	Y
3. Were the group characteristics similar at baseline?	Y	Y	Y	Y	Y	Y	N/A
4. Were eligibility criteria specified?	Y	Y	Y	Y	N	Y	Y
5. Was the outcome assessor blinded?	D/K	D/K	D/K	D/K	D/K	D/K	Y
6. Was the care provider blinded?	D/K	N	D/K	D/K	D/K	D/K	Y
7a. Was there adequate measurement of shift work?a	Y	Y	Y	Y	N	Y	N
7b. Is there relevant information on shift work schedules, patterns and duration included?	Y	Y	Y	Y	N	N	N
8. Were point estimates and measures of variability presented?	Y	Y	Y	Y	Y	Y	N/A
9. Did the analysis include intention-to-treat analysis?	Y	Y	Y	Y	N	D/K	Y
	70 7/10	70 7/10	70 7/10	70 7/10	30 3/10	50 5/10	75 6/8

Legend: D/K, don't know; N, no; Y, yes.

^aDefined as: evening or night shifts, rotating shifts, split shifts, on-call or casual shifts or 24 hour shifts.

^bStudy scored out of eight points.