Table 2.
Descriptive statistics per treatment group
| Control (n=24) | FreeO2 (n=23) | P value | |
| Total expenditures (2015 $C) | 10 269.79* (6448.28 to 17 785.93) |
5678.99* (4457.01 to 11 101.05) |
0.13 |
| Time spent at the target SpO2 (%) | 48.19* (39.86 to 64.87) | 83.83* (72.77 to 92.74) | 0.00 |
| Time spent in hyperoxia (%) | 6.33* (3.02 to 10.46) | 0.82* (0.20 to 2.06) | 0.00 |
| Time spent in hypoxaemia (%) | 1.32* (0.16 to 2.65) | 0.08* (0.04 to 0.18) | 0.00 |
| Length of hospitalisation (days) | 7.5* (6.0 to 11.0) | 6.0* (5.0 to 8.0) | 0.08 |
| Length of rehospitalisation (days)† | 0.5* (0.0 to 13.0) | 0.0* (0.0 to 7.17) | 0.47 |
| Length of rehospitalisation (days)‡ | 13.5* (5.43 to 21.0) | 20.0* (6.73 to 27.33) | 0.37 |
| Total number of rehospitalisation at 180 days | 21 | 9 | 0.09 |
| Rate of rehospitalisation at 180 days (%)§ | 50.00 (51.07) | 34.78 (48.70) | 0.29 |
| One rehospitalisation at 180 days (%) | 25.00 (9.03) | 30.43 (9.81) | 0.69 |
| Two or more rehospitalisations at 180 days (%) | 25.00 (9.03) | 4.35 (4.35) | 0.05 |
| Duration of oxygen therapy (days) | 5.5* (3.0 to 6.0) | 4.0* (2.26 to 5.0) | 0.12 |
| Oxygen consumption (L/min) | 0.69* (0.58 to 1.31) | 0.56* (0.33 to 0.76) | 0.05 |
| Total oxygen consumption (L) | 6192.0* (2687.4 to 10 969.4) | 3600.0* (1553.2 to 4426.3) | 0.05 |
| FEV1 on inclusion (% predicted) | 35.5* (30.7 to 43.7) | 32.0* (27.3 to 41.5) | 0.34 |
| Diabetic (%) | 37.50 (49.45) | 26.09 (44.90) | 0.40 |
| Active smoker (%) | 25.00 (44.23) | 47.83 (51.08) | 0.10 |
| Diabetic or active smoker (%) | 58.33 (50.36) | 65.22 (48.70) | 0.62 |
| Hypercapnia (PaCO2 >45 mm Hg) on inclusion (%) | 54.17 (50.90) | 34.78 (48.70) | 0.18 |
| Respiratory rate on inclusion (bpm) | 21.38 (2.26) | 21.83 (2.87) | 0.55 |
| Female (%) | 50.00 (51.07) | 43.48 (50.69) | 0.65 |
| Age (years) | 73.17 (8.62) | 71.17 (8.33) | 0.42 |
| Body mass index (kg/m²) | 26.97 (5.63) | 27.06 (6.34) | 0.96 |
| No. of hospitalisations in the 12 months preinclusion | 0.0* (0.0 to 1.0) | 0.0* (0.0 to 1.0) | 0.52 |
| No. of emergency department visits in the 12 months preinclusion | 1.0* (0.0 to 2.0) | 1.0* (0.0 to 1.0) | 0.97 |
| Hospitalised in the month preinclusion (%) | 12.50 (33.78) | 8.70 (28.81) | 0.67 |
Data expresses as mean with SD in parentheses, unless otherwise specified.
*Median and 95% CI in parentheses.
†Total number of days of rehospitalisation out of 180 days divided by the total number of patients (rehospitalised or not).
‡Length of rehospitalisation solely for rehospitalised patients.
§Percentage of the total of patients in that group that has one or more rehospitalisations in the 180 days.
FEV1, forced expiratory volume in 1 s.