| Duration | Mean | S.D. | Sample Size | Range | Duration ≥48 |
|---|---|---|---|---|---|
| Private (Period I) | 8.9 | 12.8 | 428 | (0.25, 120) | 10 |
| Private (Period II) | 7.8 | 8.5 | 177 | (0.25, 50) | 3 |
| Private (Period III) | 6.3 | 6.5 | 132 | (0.5, 60) | 1 |
| Non-private (Period I) | 10.1 | 11.0 | 65 | (0.25, 48) | 2 |
| Non-private (Period II) | 10.9 | 14.8 | 31 | (1,84) | 1 |
| Non-private (Period III) | 10.0 | 16.1 | 351 | (0.25, 186) | 10 |