Table 3 Regression parameters of the final logistic regression model obtained from stepwise forward variable selection (n = 9194)

 Age

19–22

reference

23–26

0.108

0.114

0.899

0.343

1.11 (0.89, 1.39)

27–38

− 0.105

0.071

2.175

0.140

0.90 (0.78, 1.04)

39–61

−0.252

0.062

16.518

< 0.0001

0.78 (0.69, 0.88)

62–69

−0.051

0.092

0.302

0.583

0.95 (0.79, 1.14)

 Amount of elective care^a

<=€3000

reference

> €3000

−0.206

0.045

20.685

< 0.0001

0.81 (0.74, 0.89)

 Amount of acute care^b

€0

reference

€0 - €10,000

0.142

0.092

2.384

0.123

1.15 (0.96, 1.38)

€10,000 - €60,000

0.026

0.095

0.074

0.786

1.03 (0.85, 1.24)

€60,000 - €90,000

−0.233

0.182

1.640

0.200

0.79 (0.55, 1.13)

> €90,000

0.300

0.164

3.336

0.068

1.35 (0.98, 1.86)

 Number of quarters^c

Both E and A

−0.317

0.013

598.308

< 0.0001

0.73 (0.71, 0.75)

E only^d

reference

A only

−0.323

0.034

91.707

< 0.0001

0.72 (0.68, 0.77)

Neither E nor A

−0.055

0.022

6.039

0.014

0.95 (0.91, 0.99)

 Intercept

0.376

0.118

10.16

0.001

1.46 (1.16, 1.84)