Effects of 30% vs. 60% inspired oxygen fraction during mechanical ventilation on postoperative atelectasis: a randomised controlled trial

Table 3 The normalized percentage of atelectasis volume (square root transformation) handled by multiple imputation and sensitivity analysis

Missing value processing method	Group	n	mean ± SD	differences (95% CI)	T	P value
Multiple imputation (Integrated)	30% FiO₂	60	1.79 ± 0.74	-0.26 (-0.57, 0.06)	-1.590	0.115
Multiple imputation (Integrated)	60% FiO₂	60	2.04 ± 1.01	-0.26 (-0.57, 0.06)	-1.590	0.115
KNN imputation	30% FiO₂	60	1.79 ± 0.74	-0.25 (-0.57, 0.07)	-1.557	0.122
KNN imputation	60% FiO₂	60	2.04 ± 1.00	-0.25 (-0.57, 0.07)	-1.557	0.122
Regression imputation	30% FiO₂	60	1.75 ± 0.74	-0.27 (-0.59, 0.05)	-1.662	0.099
Regression imputation	60% FiO₂	60	2.02 ± 1.00	-0.27 (-0.59, 0.05)	-1.662	0.099
Mean imputation	30% FiO₂	60	1.76 ± 0.73	-0.26 (-0.58, 0.06)	-1.636	0.105
Mean imputation	60% FiO₂	60	2.02 ± 1.00	-0.26 (-0.58, 0.06)	-1.636	0.105

CI, confidence interval; FiO₂, inspired oxygen fraction; KNN, K-nearest neighbor; SD, standard deviation

ISSN: 1471-2253