Table 2

Item non-response by questionnaire length

Section

Item non-response (%)

p

Long

Short

Overall

9.8

5.8

.04

A. Your neighbourhood and local area

2.8

2.5

.73

B. Walking and cycling

12.9

4.9

.01

C. Your travel

12.5

9.5

.27

D. Activities at home

6.5

n/a

-

E. Activities at work or place of study

12.4

8.6

.35

F. Recreational activities

15.1

8.3

.11

G. You and your household

6.0

9.6

.05

Sahlqvist et al. BMC Medical Research Methodology 2011 11:62   doi:10.1186/1471-2288-11-62