Table 5 Validation of missing data assumptions on complete data patients

Respiratory Rate

1. 91%

1. 307 (54.5%)

1. 88%

2. 90%

3. 64% (when FR<20), 70% (when FR[20–24]) and 58% (FR>24)

1. 263 (19.6%)

2. 134 (10%)

3. 267 (19.9%)

pH

1. 90%

1. 167 (43.6%)

1. 97%

2. 98%

3. 98%

4. 91% (pH>=7.35), 63% (pH [7.26-7.35]) and 50% (pH<7.26)

1. 937 (44%)

2. 146 (6.9%)

3. 181 (8.5%)

4. 399 (18.7%)

PO2

1. 95%

1. 173 (42.4%)

1. 90% for O2 saturation >94%; 70% for O2 saturation <90%

2. 91%

3. 77% (PO2>60), 82% (PO2 (45-60]) and 63% (PO2 <=45)

4. 63% for O2 saturation >94%; 64% for O2 saturation <90%

1. 637 (29.8%)

2. 342 (16%)

3. 386 (18.1%)

4. 121 (5.7%)

PCO2

No assumptions were made

1. 90% if PCO2 at arrival normal

2. 86% (PCO2 <=45), 73% (PCO2 (45-55]) , 75% (PCO2 (55-65]) and 80% (PCO2>65)

1. 714 (33.5%)

2. 534 (25%)