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Table 4 Item fit statistics from the GRM

From: Psychometric properties of the Danish SDM-Q-9 questionnaire for shared decision-making in patients with pelvic floor disorders and low back pain: item response theory modelling

Items

Outfit

z.outfit

Infit

z.infit

item1

1.30

2.14

1.09

1.15

item2

0.97

-0.17

1.06

0.75

item3

0.91

-0.25

0.96

-0.49

item4

0.84

-0.82

0.99

-0.09

item5

0.67

-1.07

0.99

-0.05

item6

0.79

-0.91

1.00

-0.04

item7

0.81

-1.11

0.99

-0.08

item8

0.96

-0.03

1.09

1.15

item9

0.73

-0.74

0.99

-0.04