SpO₂ (%)	Group-A n = 35	Group-B n = 35	p value
Pre-operative	99.54 ± 0.56	99.77 ± 0.43	0.058^ns
Intra-operative
15 minutes after induction	99.23 ± 0.69	99.46 ± 0.61	0.144^ns
After 30 minutes	98.80 ± 0.90	99.20 ± 0.8	0.054^ns
After 60 minutes	98.94 ± 0.97	99.03 ± 0.75	0.773^ns
After 90 minutes	98.97 ± 0.75	99.14 ± 0.69	0.353^ns
After 120 minutes	99.06 ± 0.84	99.04 ± 0.77	0.082^ns
Post-operative
15 minutes after arrival at post-operative ward	98.94 ± 0.8	99.14 ± 0.81	0.302^ns
After 30 minutes	98.71 ± 0.99	99.10 ± 0.84	0.080^ns
After 60 minutes	99.09 ± 0.85	99.14 ± 0.73	0.793^ns
After 90 minutes	99.06 ± 0.94	99.19 ± 0.61	0.062^ns
After 120 minutes	99.37 ± 0.6	99.34 ± 0.64	0.840^ns