Multiple Comparisons
Dependent Variable: Ti = rate of increase in SpO₂ during preoxygenation
Tukey HSD
(I) haemoglobin concentration categories	(J) haemoglobin concentration categories	Mean Difference (I-J)	Std. Error	Sig.	95% Confidence Interval
(I) haemoglobin concentration categories	(J) haemoglobin concentration categories	Mean Difference (I-J)	Std. Error	Sig.	Lower Bound	Upper Bound
7.0 - 9.9 g/dl	10 - 12.9 g/dl	−0:24:15	0:14:38	0.227	−0:59:09	0:10:37
7.0 - 9.9 g/dl	13 - 16 g/dl	−1:17:46*	0:14:45	0.000	−1:52:55	−0:42:37
10.0 - 12.9 g/dl	7 - 9.9 g/dl	0:24:15	0:14:38	0.227	−0:10:37	0:59:09
10.0 - 12.9 g/dl	13 - 16 g/dl	−0:53:30*	0:14:16	0.001	−1:27:31	−0:19:29
13.0? 16.0 g/dl	7 - 9.9 g/dl	1:17:46*	0:14:45	0.000	0:42:37	1:52:55
13.0? 16.0 g/dl	10 - 12.9 g/dl	0:53:30*	0:14:16	0.001	0:19:29	1:27:31