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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 *Baseline total N = 903; **Follow-up N = 832; 71 lost to follow-up due to: death; withdrawn consent; left practice; too ill; too busy; admitted to nursing home (44 intervention; 27 control).