Table 1:

Mean systemic SaO₂ (%) values in all the groups

	N	Minimum	Maximum	Mean	Standard deviation
Group I	50	92.7	98.7	97.596	1.3060
Group IIA	50	92.0	99.0	97.760	1.2707
Group IIB	50	92.7	99.0	97.522	1.4629
Group IIIA	50	95.7	98.7	97.774	.8386
Group IIIB	50	94.7	98.7	97.414	1.1450
Group IVA	25	93.7	98.7	97.228	1.2847
Group IVB	25	92.7	98.7	97.016	1.4801