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Table 2 Cox proportional hazards regressions (HR) with 95% confidence intervals (CI) for associations between SA spell duration and inpatient or specialized outpatient care episodes analyzed separately

From: The predictive role of sickness absence spell durations in associations with inpatient- and specialized outpatient care among a population-based Swedish twin sample

categorized SA spell duration Inpatient care
(n = 8385)
Outpatient care
(n = 20,743)
Age and sex adjusted model Full modela Discordant twin pairs (n = 711) Age and sex adjusted model Full modela Discordant twin pairs
(n = 603)
HR 95%CI HR 95%CI HR 95%CI HR 95%CI HR 95%CI HR 95%CI
  ≤ 30 days 1 ref 1 ref 1 ref 1 ref 1 ref 1 ref
 31–90 days 1.28 1.09, 1.50 1.28 1.09, 1.49 0.67 0.11, 2.99 1.17 1.06, 1.30 1.17 1.05, 1.29 1.03 0.35, 2.98
 91–180 days 1.41 1.12, 1.77 1.39 1.10, 1.74 2.86 0.14, 58.16 1.34 1.15, 1.57 1.34 1.14, 1.56 1.19 0.30, 4.75
  ≥ 181 days 1.70 1.44, 2.00 1.67 1.41, 1.98 1.70 0.14, 21.18 1.35 1.19, 1.52 1.35 1.20, 1.53 0.79 0.17, 3.70
no SA (0 days) 1 ref 1 ref 1 ref 1 ref 1 ref 1 ref
  ≤ 30 days 2.75 2.39, 3.16 1.66 1.52, 1.81 3.18 1.84, 5.50 1.96 1.82, 2.12 2.04 1.89, 2.21 2.39 1.78, 3.20
 31–90 days 3.38 2.65, 4.31 2.15 1.84, 2.52 4.93 1.76, 13.82 2.29 1.97, 2.68 2.35 2.01, 2.75 2.49 1.44, 4.32
 91–180 days 4.41 3.03, 6.43 2.40 1.86, 3.10 4.90 1.19, 20.21 3.10 2.43, 3.91 3.11 2.43, 3.97 2.28 1.13, 4.59
  ≥ 181 days 6.05 4.40, 8.33 3.00 2.50, 3.60 5.76 1.79, 18.46 2.50 1.95, 3.20 2.60 2.03, 3.33 3.23 1.60, 6.51
  1. aFull model adjusted for age, sex, education, family status and living area