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

  ≤ 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