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Table 4 Effect of predictor variables on percentage of time spent in, above and below range

From: Determination of oxygen saturation compared to a prescribed target range using continuous pulse oximetry in acutely unwell medical patients

Predictor variable SpO2 below target range
% increase or difference (95% CI)
SpO2 within target range
% increase or difference (95% CI)
SpO2 above target range
% increase or difference (95% CI)
Univariate Multivariate Univariate Multivariate Univariate Multivariate
Agea − 2.8 (− 7.1 to 1.6)
P = 0.21
− 4.3 (− 8.7 to 0.4)
P = 0.052
1.6 (− 2.5 to 5.7)
P = 0.44
1.7 (− 2.3 to 5.7)
P = 0.41
1.0 (− 3.2 to 5.2)
P = 0.64
2.5 (− 1.3 to 6.3)
P = 0.20
Oxygen adjustmentsb 1.5 (− 0.9 to 4.0)
P = 0.22
2.7 (0.04 to 5.4)
P = 0.047
0.5 (− 1.8 to 2.8)
P = 0.69
− 1.0 (− 3.5 to 1.4)
P = 0.40
− 2.1 (− 4.4 to 0.3)
P = 0.08
− 1.7 (− 4.1 to 0.7)
P = 0.15
HDUc − 5.2 (− 18.3 to 7.9)
P = 0.43
− 12.7 (− 27.1 to 1.7)
P = 0.082
11.6 (− 0.5 to 23.7)
P = 0.06
15.5 (2.3 to 28.7)
P = 0.02
− 6.5 (− 19.1 to 6.0)
P = 0.30
− 3.0 (− 15.6 to 9.7)
P = 0.64
Target ranged 7.9 (− 3.3 to 19.1)
P = 0.16
8.4 (− 2.7 to 19.4)
P = 0.13
12.8 (2.6 to 23.0)
P = 0.014
13.1 (3.0 to 23.2)
P = 0.012
− 21.0 (− 30.7 to − 11.3)
P < 0.001
− 21.6 (− 31.4 to − 12.0)
P < 0.001
  1. aPer decade older
  2. bPer one adjustment
  3. cHigh dependency area versus non-high dependency area
  4. dTarget SpO2 range 92–96% versus reduced hypercapnic range