Table 3.

Sample characteristics of observations

	Site A	Site B	Site C	Site D	Site E
Number of operations (mean, range of operating duration; hh:mm)	175 (1:56, 0:27–13:32)	63 (2:02, 0:27–4:45)	96 (1:47, 0:22–3:58)	72 (1:46, 0:30–3:55)	24 (3:11, 0:43–7:28)
Elective orthopaedics	130 (1:49, 0:27–4:25)	63 (2:02, 0:27–4:45)	54 (1:49, 0:27–3:41)	51 (1:54, 1:01–3:55)	0
Trauma orthopaedics	0	0	42 (1:44, 0:22–3:58)	0	0
Plastic surgery	45 (2:17, 0:30–13:32)	0	0	0	0
Vascular surgery	0	0	0	21 (1:25, 0:30–2.24)	24 (3:11, 0:43–7:28)