Variable	Category	Frequency (n)	Percent (%)	Variable	Category	Frequency	Percent
Age group (years)	< 35	302	75.9	Year of residency	1^st year	159	39.9
	>35	96	24.1		2^nd year	139	34.9
	>35	96	24.1		3^rd year	100	25.1
Gender	Male	243	61.1	Sponsorship	Sponsored	284	71.4
Gender	Female	155	38.9	Sponsorship	Not Sponsored	114	28.6
Marital status	Married	256	64.3	Night sleep hours	Adequate	57	14.3
Marital status	Single	146	35.7	Night sleep hours	Inadequate	341	85.7
Having Children	Yes	256	64.3	Number of night shifts per month	<5 calls	234	58.8
Having Children	No	142	35.7	Number of night shifts per month	5 - 10 calls	121	30.4
Employment status	Employed	325	81.7	Call perception	Stressful	206	65.8
Employment status	Not Employed	73	18.3	Call perception	Not stressful	136	34.2
Smoking	Yes	16	4	Remuneration	Adequate	66	16.6
	No	382	96		Not adequate	208	52.3
	No	382	96		No renumeration	124	31.2
Alcohol use	Yes	112	28.1	Support from supervisors	Adequate	222	55.8
	No	286	71.9		Not adequate	167	42
	No	286	71.9		No support	9	2.3
Exercise	Yes	260	65.3	Years of experience	< 5	163	41.0
	No	138	34.7		5 - 10	194	48.7
	No	138	34.7		>10	41	10.3
Chronic disease	Yes	30	7.5
Chronic disease	No	368	92.5
Accommodation	At University hostels	121	30.4
Accommodation	Outside University hostels	277	69.6