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Table 1 Numbers who returned valid and invalid questionnaire scores at different time points during the SPHERE Study

From: Using postal questionnaires to evaluate physical activity and diet behaviour change: case study exploring implications of valid responder characteristics in interpreting intervention outcomes

  Total questionnaires returned
  Valid scores Invalid scores
  N (%) N (%)
Godin   
Baseline* 541 (59.1) 362 (40.9)
Follow-up** 523 (62.9) 309 (37.1)
DINE fibre   
Baseline* 861 (95.4) 42 (4.6)
Follow-up** 716 (86.1) 116 (13.9)
DINE total fat   
Baseline* 814 (90.1) 89 (9.90)
Follow-up** 673 (80.9) 159 (19.1)
  1. *Baseline total N = 903; **Follow-up N = 832; 71 lost to follow-up due to: death; withdrawn consent; left practice; too ill; too busy; admitted to nursing home (44 intervention; 27 control).