Table 4.

End-tidal CO₂ (mmHg) in groups I, II, and III

Stage	Group I Mean±SD	Group II Mean±SD	Group III Mean±SD	F value	P value	Result
Immediately during insufflation	31.96 ± 2.74	32.28 ± 3.02	34.68 ± 3.30	6.014	0.003	SIG.
5 min after CO2 insufflation	32.92 ± 2.76	33.12 ± 2.92	37.92 ± 2.78	25.114	0.0001	H.S.
10 min after CO2 insufflation	33.56 ± 2.69	34.08 ± 3.01	41.04 ± 2.55	57.196	0.00	H.S.
20 min after CO2 insufflation	34.20 ± 2.70	35.88 ± 2.54	42.80 ± 1.85	72.145	0.00	H.S.
30 min after CO2 insufflation	37.00 ± 2.58	–a	43.80 ± 1.09	12.13b	0.0001	H.S.
At exsufflation	33.00 ± 2.95	33.84 ± 2.96	40.12 ± 1.92	53.434	0.00	H.S.
10 min after exsufflation	32.04 ± 2.92	32.20 ± 3.16	37.52 ± 2.12	31.647	0.0001	H.S.

^aIn this group, only one patient’s surgery continued till 30 min with a value-39.

^bUnpaired Student’s t test(two tailed) used to assess difference. (F=ANOVA)