Table 2.
PHQ-9 scores of 1626 university students during the follow-up period in the HCT’s seasonal cohorts
| Time | 8w | 12w | 16w | 20w | 24w | 28w | 32w | 36w | 40w | 44w | 48w | 52w |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Autumn (n = 522) | ||||||||||||
| Valid % | 93.3 | 74.1 | 73.6 | 68.8 | 77.6 | 62.3 | 60.9 | 56.1 | 56.1 | 55.9 | 54.8 | 81.4 |
| PHQ–9 | ||||||||||||
| Mean | 5.0 | 5.4 | 5.5 | 5.3 | 5.3 | 5.9 | 6.1 | 5.9 | 5.8 | 5.7 | 5.5 | 5.6 |
| Median | 4.0 | 5.0 | 5.0 | 5.0 | 4.0 | 5.0 | 5.0 | 5.0 | 5.0 | 4.5 | 5.0 | 4.0 |
| Range | 0–22 | 0–22 | 0–21 | 0–20 | 0–27 | 0–25 | 0–27 | 0–23 | 0–24 | 0–20 | 0–23 | 0–26 |
| IQR | 2.0–7.0 | 2.0–7.0 | 2.0–8.0 | 2.0–8.0 | 2.0–8.0 | 2.5–8.0 | 2.0–9.0 | 2.0–9.0 | 2.0–8.0 | 2.0–9.0 | 2.0–8.0 | 2.0–8.0 |
| Spring (n = 1104) | ||||||||||||
| Valid % | 92.8 | 73.3 | 70.4 | 66.5 | 72.6 | 60.7 | 59.1 | 58.2 | 55.4 | 58.2 | 60.0 | 80.3 |
| PHQ-9 | ||||||||||||
| Mean | 5.3 | 5.4 | 5.2 | 4.9 | 5.3 | 5.2 | 5.2 | 5.2 | 5.3 | 5.0 | 4.8 | 5.1 |
| Median | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 |
| Range | 0–24 | 0–26 | 0–24 | 0–26 | 0–24 | 1–27 | 0–25 | 0–25 | 0–27 | 0–24 | 0–26 | 0–24 |
| IQR | 2.0–7.0 | 2.0–8.0 | 2.0–7.0 | 2.0–7.0 | 2.0–8.0 | 2.0–8.0 | 2.0–7.0 | 2.0–8.0 | 2.0–8.0 | 2.0–7.0 | 2.0–7.0 | 2.0–7.0 |
HCT Healthy Campus Trial, IQR interquartile range, PHQ-9 Patient Health Questionnaire-9, valid % is the percentage of observations in each evaluation point out of the total number in the seasonal cohort