Table 3 Associations of pain chronicity, pain sites, mental health, and their interactions with total and long-term sickness absence days per person years during 1- year follow-up
| Â | Total sickness absence | Â | Long-term sickness absence | ||
|---|---|---|---|---|---|
Model 1 | Model 2 | Synergy index | Model 1 | Model 2 | |
RR (95% CI) | RR (95% CI) | Â | RR (95% CI) | RR (95% CI) | |
Pain chronicity | |||||
 No pain | 1.00 | 1.00 |  | 1.00 | 1.00 |
 Acute | 1.45 (1.28–1.63) | 1.36 (1.21–1.53) |  | 1.71 (0.93–3.16) | 1.70 (0.92–3.15) |
 Chronic | 1.87 (1.64–2.12) | 1.66 (1.47–1.89) |  | 2.19 (1.13–4.21) | 1.96 (1.01–3.79) |
Pain sites | |||||
 No pain | 1.00 | 1.00 |  | 1.00 | 1.00 |
 Single site | 1.32 (1.14–1.52) | 1.28 (1.11–1.47) |  | 1.19 (0.57–2.46) | 1.14 (0.54–2.40) |
 Multisite | 1.81 (1.62–2.02) | 1.62 (1.44–1.81) |  | 2.34 (1.31–4.16) | 2.19 (1.22–3.90) |
Mental health | |||||
 Better | 1.00 | 1.00 |  | 1.00 | 1.00 |
 Poorer | 1.70 (1.54–1.87) | 1.63 (1.48–1.8) |  | 2.81 (1.71–4.60) | 2.73 (1.65–4.54) |
Pain chronicity by pain sites | |||||
 No pain | 1.00 | 1.00 |  | 1.00 | 1.00 |
 Acute single site | 1.17 (0.97–1.40) | 1.16 (0.97–1.39) |  | 1.26 (0.50–3.21) | 1.33 (0.51–3.43) |
 Acute multisite | 1.60 (1.39–1.84) | 1.47 (1.28–1.69) |  | 1.97 (0.95–4.05) | 1.90 (0.92–3.93) |
 Chronic single site | 1.51 (1.23–1.84) | 1.43 (1.17–1.75) |  | 1.09 (0.39–3.04) | 0.91 (0.32–2.59) |
 Chronic multisite | 2.05 (1.77–2.37) | 1.78 (1.54–2.06) | 0.95 (0.63–1.42) | 2.76 (1.29–5.93) | 2.51 (1.17–5.42) |
Pain chronicity by mental health | |||||
 No pain, better mental health | 1.00 | 1.00 |  | 1.00 | 1.00 |
 No pain, poorer mental health | 1.69 (1.49–1.92) | 1.66 (1.47–1.89) |  | 2.95 (1.55–5.63) | 2.73 (1.39–5.37) |
 Acute, better mental health | 1.62 (1.36–1.93) | 1.55 (1.31–1.85) |  | 2.17 (0.88–5.35) | 2.12 (0.86–5.24) |
 Acute, poorer mental health | 2.14 (1.82–2.5) | 1.94 (1.66–2.27) |  | 4.07 (1.81–9.14) | 3.65 (1.59–8.35) |
 Chronic, better mental health | 1.69 (1.38–2.07) | 1.50 (1.23–1.83) |  | 1.83 (0.65–5.13) | 1.20 (0.40–3.59) |
 Chronic, poorer mental health | 2.90 (2.47–3.41) | 2.58 (2.20–3.02) | 1.38 (0.99–1.91) | 5.53 (2.42–12.63) | 5.04 (2.14–11.87) |
Pain sites by mental health | |||||
 No pain, better mental health | 1.00 | 1.00 |  | 1.00 | 1.00 |
 No pain, poorer mental health | 1.69 (1.49–1.92) | 1.66 (1.46–1.88) |  | 2.94 (1.54–5.60) | 2.72 (1.38–5.34) |
 Single site, better mental health | 1.27 (1.04–1.56) | 1.22 (1.00–1.49) |  | 1.20 (0.43–3.39) | 1.04 (0.36–2.97) |
 Single site, poorer mental health | 2.17 (1.78–2.63) | 2.11 (1.74–2.56) |  | 3.27 (1.21–8.87) | 3.17 (1.11–9.03) |
 Multisite, better mental health | 1.91 (1.61–2.28) | 1.75 (1.47–2.08) |  | 2.61 (1.07–6.36) | 2.26 (0.91–5.61) |
 Multisite, poorer mental health | 2.66 (2.31–3.07) | 2.31 (2.00–2.66) | 1.03 (0.78–1.36) | 5.48 (2.64–11.37) | 4.88 (2.3–10.33) |