Table 4 Associations between group-status and primary healthcare usage. Separate multivariable Poisson models are fitted for the four outcomes: overall number of contacts, contacts to GP, physiotherapist, or chiropractor. Presented are estimated incidence rate ratios (IRR) with corresponding 95% confidence intervals (CI) for the children in the CHAMPS-Group against reference Local Controls. Adjustment factors were Children’s gender, parents healthcare^a use in the period before CHAMPS-study DK, and the equivalised disposable family income^b

IRR

95% CI

p-value

IRR

95% CI

p-value

IRR

95% CI

p-value

IRR

95% C)

p-value

 Constant (Local controls)

0.04

(0.02–0.07)

< .001

0.04

0.04–0.05

< .001

5.67

5.54–5.81

< .001

5.75

5.61–5.89

< .001

 Group (ref local controls)

0.27

(0.11–0.66)

.04

1.20

0.93–1.56

.16

1.03

0.99–1.07

.11

1.03

0.99–1.06

.15

 Group (ref local controls)

0.27

0.11–0.68

< .01

1.11

0.41–1.11

.44

1.04

1.01–1.08

.02

1.03

0.99–1.06

.14

 Gender (ref boys)

1.00

0.31–3.27

1.00

0.81

0.63–1.05

.11

0.96

0.93–0.99

.01

0.96

0.93–1.00

.03

Income (ref low)

 Middle

0.49

0.15–1.64

.25

1.28

0.91–1.80

.15

1.04

1.00–1.08

.07

1.05

1.00–1.09

.03

 High

1.43

0.32–6.41

.64

1.36

0.95–1.96

.09

1.02

0.98–1.07

.29

1.05

1.00–1.10

.03

Parents´ healthcare (ref low)

 Middle

–

–

–

–

–

–

1.12

1.07–1.18

< .001

1.30

1.24–1.36

< .001

 High

1.91

0.57–6.45

.30

3.59

2.75–4.68

< .001

1.39

1.33–1.45

< .001

1.67

1.60–1.74

< .001

 Constant (Local controls)

0.13

0.08–0.22

< .001

0.10

0.08–0.12

< .001

2.53

2.44–2.61

< .001

2.75

2.64–2.87

< .001

 Group (ref local controls)

0.44

0.24–0.81

< .01

1.44

1.11–1.86

< .01

0.92

0.87–0.96

< .001

0.91

0.86–0.97

< .002

 Group (ref local controls)

0.42

0.24–0.75

< .01

1.30

1.00–1.69

.05

0.92

0.88–0.97

< .01

0.91

0.86–0.97

< .002

 Gender (ref boys)

2.22

1.12–4.44

.02

1.12

0.87–1.46

.38

1.18

1.13–1.24

< .001

1.21

(1.14–1.28)

< .001

 Income (ref low)

 Middle

0.83

0.27–2.55

.74

2.24

1.53–3.29

< .001

0.95

0.90–1.01

.10

0.98

0.91–1.05

.52

 High

1.44

0.56–3.71

.45

2.54

1.76–3.67

< .001

0.93

0.87–0.99

.03

0.98

0.91–1.06

.68

 Constant (Local controls)

0.13

0.10–0.17

< .001

0.16

0.14–0.18

< .001

3.43

3.31–3.54

< .001

3.71

3.58–3.85

< .001

 Group (ref local controls)

0.97

0.71–1.34

.87

1.35

1.08–1.69

.08

0.94

0.89–0.98

.01

0.96

0.91–1.01

.08

 Group (ref local controls)

0.88

0.63–1.23

.46

1.15

0.92–1.45

.22

0.94

0.90–0.99

<.02

0.95

0.91–1.00

<.05

 Gender (ref boys)

1.93

1.38–2.69

< .001

1.08

0.86–1.34

.51

1.85

1.77–1.94

< .001

1.80

1.72–1.89

< .001

 Income (ref low)

 Middle

1.32

0.87–2.00

.19

2.01

1.50–2.69

< .001

0.92

0.87–0.97

< .01

0.96

0.90–1.01

.14

 High

1.78

1.07–2.98

.03

3.10

2.32–4.14

< .001

0.87

0.82–0.92

< .001

0.95

0.89–1.01

.09