From: Chronic pain treatment in children and adolescents: less is good, more is sometimes better
 |  |  | Statistics | |||||
---|---|---|---|---|---|---|---|---|
 |  | School absence at return visit |  | Mann-Whitney U-Test | ||||
School absence & at initial visit | Group | Low (0–1 days) | Moderate (2–5 days) | High (>5 days) | U | Z | p-value | r |
Low (0–1 days) | Outpatients | 454 (92.5) | 34 (6.9) | 3 (0.6) | 17,792 | -0.6 | .524 | - |
Inpatients | 70 (94.6) | 3 (4.1) | 1 (1.4) | Â | Â | Â | Â | |
Moderate (2–5 days) | Outpatients | 181 (71.3) | 64 (25.2) | 9 (3.5) | 7,691 | -2.7 | .006 | |-.151| |
Inpatients | 63 (87.5) | 7 (9.7) | 2 (2.8) | Â | Â | Â | Â | |
High (>5Â days) | Outpatients | 69 (73.4) | 16 (17.0) | 9 (9.6) | 6,988 | 1.8 | .068 | - |
 | Inpatients | 83 (62.4) | 28 (21.1) | 22 (16.5) |  |  |  |  |