From: Increasing questionnaire response: evidence from a nested RCT within a longitudinal birth cohort study
Quintile group
IMD score range
1
≤ 8.49 (Least deprived)
2
8.5 - 13.79
3
13.8 - 21.35
4
21.36 - 34.17
5
≥ 34.18 (Most deprived)