Table 4 Associations between background variables at baseline and CMP at follow-up (n = 153–154) based on logistic regression analysis
Baseline variables | Model 1 No CMP at follow-up = 0 (n = 115) CMP at follow-up = 1 (n = 39) | Model 2 No CMP at follow-up = 0 (n = 115) CMP at follow-up = 1 (n = 38) | ||
|---|---|---|---|---|
OR | (95% CI; p-value) | OR | (95% CI; p-value) | |
Sex | ||||
 Boys | 1.00 |  | 1.00 |  |
 Girls | 1.67 | (0.74–3.76; p = 0.217) | 1.05 | (0.41–2.67; p = 0.916) |
EQ-5D | ||||
 EQ-5D ≥ 0.85 | 1.00 |  | 1.00 |  |
 EQ-5D < 0.85 | 4.06 | (1.83–9.01; p = 0.001) | 2.04 | (0.77–5.36; p = 0.149) |
Problems initiating sleep | ||||
 None to moderate | 1.00 |  |  |  |
 Severe to very severe | 3.44 | (1.24–9.54; p = 0.018) |  |  |
Problems maintaining sleep | ||||
 None to moderate | 1.00 |  |  |  |
 Severe to very severe | 3.04 | (0.41–22.62; p = 0.277) |  |  |
Problems with early morning awakening | ||||
 None to moderate | 1.00 |  |  |  |
 Severe to very severe | 2.69 | (0.77–9.44; p = 0.122) |  |  |
Problems with non-restorative sleep | ||||
 None to moderate | 1.00 |  |  |  |
 Severe to very severe | 2.60 | (1.18–5.70; p = 0.018) |  |  |
Severe sleeping problems | ||||
 No severe sleeping problems | 1.00 |  | 1.00 |  |
 Severe sleeping problems | 3.63 | (1.69–7.82; p = 0.001) | 2.06 | (0.84–5.07; p = 0.115) |
Stress | ||||
 Points 1–3 | 1.00 |  |  |  |
 Points 4–5 | 1.75 | (0.76–4.02; p = 0.187) |  |  |
HADS anxiety | ||||
 Non-cases | 1.00 |  | 1.00 |  |
 Possible cases | 4.19 | (1.74–10.11; p = 0.001) | 2.31 | (0.86–6.20; p = 0.095) |
 Probable cases | 3.82 | (1.17–12.48; p = 0.027) | 1.27 | (0.31–5.24; p = 0.740) |
HADS depression | ||||
 Non-cases | 1.00 |  |  |  |
 Possible cases | 1.61 | (0.45–5.72; p = 0.465) |  |  |
 Probable cases | – |  |  |  |
IPAQ | ||||
 Low | 1.00 |  |  |  |
 Moderate | 2.39 | (0.60–9.58; p = 0.217) |  |  |
 High | 1.64 | (0.42–6.41; p = 0.476) |  |  |
CMP | ||||
 No CMP | 1.00 |  | 1.00 |  |
 CMP | 5.51 | (2.23–13.61; p < 0.001) | 2.99 | (1.09–8.24; p = 0.034) |
 Do not know or missing | 1.45 | (0.42–4.99; p = 0.556) | 0.79 | (0.18–3.49; p = 0.756) |