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["Supplementary Table 1. Baseline characteristics of the three groups."]
["Variable","Group R(n=30)","Group P(n=30)","Group C(n=30)","c2/F","P value"]
["Sex, n (%)",{"$nulls":3},0.39,0.821]
["Male","11(36.7%)","9(30.0%)","11(36.7%)"]
["Female","19 (63.3%)","21 (70.0%)","19 (63.3%)"]
["Smoking",{"$nulls":3},0.32,0.853]
["Yes","8(26.7%)","9(30.0%)","10(33.3%)"]
["No","22 (73.3%)","21 (70.0%)","20 (66.7%)"]
["OSA",{"$nulls":3},0.74,0.69]
["Yes","3(10.0%)","2(6.7%)","4(13.3%)"]
["No","27 (90.0%)","28 (93.3%)","26 (86.7%)"]
["Age (years)","34.03±7.40","31.40±6.80","33.47±9.59",0.897,0.412]
["BMI (kg/m²)","39.34±4.72","39.83±4.21","39.13±4.16",0.205,0.815]
["HR (bpm)","79.97±6.54","79.83±7.04","80.43±5.49",0.073,0.93]
["SBP (mmHg)","133.40±11.19","132.07±11.88","132.60±12.26",0.097,0.907]
["DBP (mmHg)","78.03±10.41","75.33±13.00","78.73±9.50",0.789,0.457]
["SpO2 (%)","97.10±1.65","97.50±1.53","97.33±1.61",0.477,0.622]
["PaO2 (mmHg)","87.90±7.60","88.27±5.71","88.83±7.39",0.137,0.872]
["OI (mmHg)","4.19±0.36","4.20±0.27","4.23±0.35",0.138,0.871]
["RI","0.31±0.12","0.30±0.12","0.32±0.13",0.192,0.825]
["Abbreviations: BMI, body mass index; OSA, obstructive sleep apnea; HR, heart rate; SBP, systolic blood pressure; DBP, diastolic blood pressure; SpO₂, peripheral oxygen saturation; PaO₂, partial pressure of oxygen; OI, oxygenation index; RI, respiratory index. Values are expressed as n (%) or mean ± SD. No significant differences were found among the three groups (all P > 0.05). All variables were recorded before anesthesia induction (preoperatively)."]

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