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Table 3 Differential item functioning across having children under the age of 18

From: Impact of Event Scale-6 (IES-6) for U.S. adults who experienced the COVID-19 pandemic

Item number

Having children under 18 years old (No vs. Yes)

DIF

Joint

Rasch-Welch

Contrast

SE

t

df

Prob.

1

−.26

.13

−2.04

270

.04

2

−.17

.13

−1.33

267

.19

3

.21

.12

1.73

275

.08

4

−.07

.13

−.56

289

.58

5

.47a

.13

3.71

272

.00*

6

−.21

.13

−1.62

289

.11

  1. Note. Reference group = Having children under 18 years old, DIF = differential item functioning
  2. aAbsolute value of DIF contrast over .43
  3. *p < .001