Table 5.
Binary linear regression with psychiatric disorder at T2 as dependent variable, and the listed covariates one at a time
| Co-variable at T1 | n | Any psychiatric disorder T2 | |||||
|---|---|---|---|---|---|---|---|
| Co-variable T1 NO n (%) |
Co-variable T1 YES n (%) |
RDa % | 95% CI for RD | p value | |||
| Lower | Upper | ||||||
| Total sample | 440 | ||||||
| Chronic pain | 438 | 84/134 (62.7)b | 243/304 (79.9) | 17.2 | 7.9 | 26.6 | < 0.001 |
| Any somatic disorder | 440 | 269/359 (74.9) | 59/81 (72.8) | − 2.1 | − 12.8 | 8.6 | 0.701 |
| Smoking | 304 | 151/205 (73.7) | 84/99 (84.8) | 11.2 | 1.9 | 20.5 | 0.018 |
| Alcohol use | 440 | 160/224 (71.4) | 168/216 (77.8) | 6.3 | − 1.8 | 14.5 | 0.125 |
| Drug use | 437 | 272/376 (72.3) | 54/61 (88.5) | 16.2 | 7.0 | 25.4 | 0.001 |
| Age | 440 | 0.105c | − 2.39 | 2.60 | 0.934 | ||
| SES | 326 | 0.012d | − 2.82 | 2.80 | 0.993 | ||
| Girls | 245 | ||||||
| Chronic pain | 245 | 24/43 (55.8) | 164/202 (81.2) | 25.4 | 9.6 | 41.2 | 0.002 |
| Any somatic disorder | 245 | 149/192 (77.6) | 39/53 (73.6) | − 4.0 | − 17.3 | 9.3 | 0.553 |
| Smoking | 178 | 81/112 (72.3) | 58/66 (87.9) | 15.6 | 4.1 | 27.0 | 0.008 |
| Alcohol use | 245 | 78/105 (74.3) | 110/140 (78.6) | 4.3 | − 6.5 | 15.1 | 0.437 |
| Drug use | 244 | 153/207 (73.9) | 34/37 (91.9) | 18.0 | 7.3 | 28.6 | 0.001 |
| Age | 245 | 0.200 | − 3.21 | 3.61 | 0.908 | ||
| SES | 177 | 0.797 | − 4.58 | 2.98 | 0.680 | ||
| Boys | 195 | ||||||
| Chronic pain | 193 | 60/91 (65.9) | 79/102 (77.5) | 11.5 | − 1.2 | 24.2 | 0.076 |
| Any somatic disorder | 195 | 120/167 (71.9) | 20/28 (71.4) | − 0.4 | − 18.5 | 17.7 | 0.963 |
| Smoking | 126 | 70/93 (75.3) | 26/33 (78.8) | 3.5 | − 13.0 | 20.1 | 0.677 |
| Alcohol use | 195 | 82/119 (68.9) | 58/76 (76.3) | 7.4 | − 5.3 | 20.1 | 0.253 |
| Drug use | 193 | 119/169 (70.4) | 20/24 (83.3) | 12.9 | − 3.5 | 29.4 | 0.124 |
| Age | 195 | 0.881 | − 4.78 | 3.01 | 0.657 | ||
| SES | 149 | 0.944 | − 3.24 | 5.13 | 0.659 | ||
aRD is risk difference, the difference between the proportions of patients with persistent psychiatric disorder and co-variable present at T1 compared with patients with persistent psychiatric disorder without present co-variable at T1
bThe numbers in this table, for example 84/134 (62.7) and 243/304 (79.9), indicate that among the 134 patients with a psychiatric disorder and no chronic pain at T1, 84 had a psychiatric disorder at T2, and among the 304 patients with a psychiatric disorder and chronic pain at T1, 243 had a psychiatric disorder at T2
cThe risk of having a persistent psychiatric disorder increases with 0.105% per one year increase of age
dThe risk of having a persistent psychiatric disorder increases with 0.012% per one unit change in level of mothers education