. Author manuscript; available in PMC: 2014 May 11.

Published in final edited form as: JAMA Intern Med. 2013 Apr 22;173(8):657–663. doi: 10.1001/jamainternmed.2013.351

Table 2. Duty Hours, Sleep, Depressive Symptoms and Medical Errors in Pre- and Post- Duty Hour Restriction Cohorts.

		2009	2010	2011
Duty Hours (hours/week)^***	1^st quarter	68.76	67.07	66.68
	2^nd quarter	68.40	65.87	63.78
	3^rd quarter	68.08	65.70	64.65
	4^th quarter	67.05	65.41	61.45
Sleep (hours/day)	1^st quarter	6.85	7.13	7.24
	2^nd quarter	6.84	6.51	7.08
	3^rd quarter	6.87	6.35	6.99
	4^th quarter	6.82	6.48	6.52
PHQ Depressive Symptom Score	1^st quarter	6.02	5.47	5.77
	2^nd quarter	5.87	5.86	5.80
	3^rd quarter	5.99	6.35	5.84
	4^th quarter	5.56	5.67	5.42
Serious Medical Error (%)^*	1^st quarter	19.3%	17.6%	22.7%
	2^nd quarter	20.4%	22.2%	24.2%
	3^rd quarter	20.6%	23.3%	22.6%
	4^th quarter	18.0%	18.3%	23.3%

indicates P < 0.05;

^***

indicates P < 0.001