Table 3 Associations between group-status and primary healthcare usage. Separate multivariable Poisson models are fitted for the four outcomes: overall number of contacts, contacts with 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 National 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 (National controls)

0.02

0.02–0.03

< .001

0.03

0.03–0.03

< .001

5.84

(5.80–5.87)

< .001

5.89

5.85–5.92

< .001

 Group (ref national controls)

0.44

0.25–0.77

.004

1.82

1.50–2.21

< .001

1.00

0.97–1.03

.94

1.00

0.98–1.03

.83

 Group (ref national controls)

0.44

0.25–0.78

<.005

1.54

1.27–1.86

< .001

0.99

0.96–1.01

.27

0.95

0.93–0.98

< .001

 Gender (ref boys)

0.80

0.50–1.26

.33

0.84

0.76–0.93

< .001

0.94

0.93–0.95

< .001

0.95

0.94–0.96

< .001

Income (ref low)

 Middle

1.09

0.64–1.87

.75

1.59

1.37–1.84

< .001

1.06

1.05–1.08

< .001

1.09

1.08–1.10

< .001

 High

1.58

0.95–2.63

.08

1.82

1.57–2.10

< .001

1.05

1.03–1.06

< .001

1.10

1.09–1.11

< .001

Parents´ healthcare (ref low)

 Middle

–

–

–

–

–

–

1.12

1.10–1.13

< .001

1.37

1.36–1.39

< .001

 High

1.46

0.93–2.28

.10

3.92

3.54–4.34

< .001

1.42

1.40–1.44

< .001

1.82

1.80–1.85

< .001

 Constant (National controls)

0.11

0.10–0.12

< .001

0.05

0.05–0.05

< .001

2.73

2.71–2.75

< .001

2.89

2.87–2.92

< .001

 Group (ref national controls)

0.53

0.39–0.72

< .001

2.75

2.30–3.30

< .001

0.85

0.82–0.88

< .001

0.87

0.84–0.90

< .001

 Group (ref national controls)

0.53

0.39–0.72

< .001

2.66

2.22–3.18

< .001

0.85

0.82–0.88

< .001

0.87

0.84–0.90

< .001

 Gender (ref boys)

1.07

0.86–1.34

.52

1.19

1.07–1.34

<.002

1.15

1.13–1.17

< .001

1.15

1.13–1.17

< .001

Income (ref low)

 Middle

1.03

0.75–1.42

.86

1.88

1.60–2.21

< .001

0.94

0.92–0.96

< .001

0.96

0.93–0.98

< .001

 High

1.36

1.01–1.84

.04

2.30

1.98–2.67

< .001

0.91

0.90–0.93

< .001

0.94

0.92–0.96

< .001

 Constant (National controls)

0.18

0.17–0.19

< .001

0.09

(.09–0.10

< .001

3.71

3.68–3.74

< .001

3.99

3.95–4.02

< .001

 Group (ref national controls)

0.69

0.58–0.83

< .001

2.29

1.93–2.71

< .001

0.86

0.83–0.90

< .001

0.89

0.86–0.92

< .001

 Group (ref national controls)

0.67

0.56–0.80

< .001

2.17

1.83–2.57

< .001

0.86

0.83–0.89

< .001

0.88

0.85–0.91

< .001

 Gender (ref boys)

1.65

1.45–1.89

< .001

1.47

1.35–1.60

< .001

1.84

1.82–1.87

< .001

1.82

1.79–1.85

< .001

Income (ref low)

 Middle

1.15

0.96–1.38

.12

1.75

1.56–1.97

< .001

0.90

0.88–0.92

< .001

0.92

0.90–0.94

< .001

 High

1.29

1.09–1.52

< .01

2.12

1.90–2.38

< .001

0.87

0.85–0.89

< .001

0.90

0.88–0.92

< .001