Table 2.
Impact of Different Strategies for Imputing Adherence Missing Values on Mean Adherence Value and Rate of Patients With Mean PAP Use of ≥ 4 h/night
| Variable | Study Period |
||
|---|---|---|---|
| 1 mo | 2 mo | 3 mo | |
| Missing values, mean (SD), No. | 0.5 (2.6) | 1.6 (5.9) | 3.5 (11.2) |
| Maximum missing values, No. | 29 | 58 | 86 |
| All samples | |||
| No strategy for missing values | |||
| Individual average PAP adherence, mean (SD), h/night | 4.61 (2.4) | 4.62 (2.4) | 4.6 (2.4) |
| PAP-adherent patients,a No. (%) | 257 (63) | 255 (63) | 255 (63) |
| Replacing missing values by zeros | |||
| Individual average PAP adherence, mean (SD), h/night | 4.56 (2.4) | 4.55 (2.4) | 4.5 (2.4) |
| PAP-adherent patients,a No. (%) | 252 (62) | 249 (61) | 251 (62) |
| Removing patients with missing values | |||
| Individual average PAP adherence, mean (SD), h/night | 4.69 (2.4) | 4.85 (2.3) | 4.89 (2.3) |
| PAP-adherent patients,a No. (%) | 239 (64) | 230 (66) | 221 (67) |
| Patients with missing values, No. (%) | 33 (8) | 60 (15) | 78 (19) |
| No strategy for missing values | |||
| Individual average PAP adherence, mean (SD), h/night | 3.67 (2.4) | 3.29 (2.4) | 3.36 (2.4) |
| PAP-adherent patients,a No. (%) | 18 (55) | 25 (42) | 34 (44) |
| Replacing missing values by zeros | |||
| Individual average PAP adherence, mean (SD), h/night | 3.0 (2.1) | 2.78 (2.2) | 2.86 (2.3) |
| PAP-adherent patients,a No. (%) | 13 (39) | 19 (32) | 30 (38) |
Results are presented for two different populations: the entire sample (N = 407) and the subsample of patients for whom values are missing.
a
With mean PAP use ≥ 4 h/night.