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Table 1 Baseline demographics and response rates

From: Internet trials: participant experiences and perspectives

  Whole sample (n=1246) Survey responders (n=416) Survey non-responders (n=830) Comparison between responders and non-responders
Age     
mean (SD) 42.9 (13.1) 46.3 (13.1) 41.2 (12.8) t1244=−6.59, p<0.0001
range 21-88 23-78 21-88  
median 42 45.5 39  
Gender     
male n (%)* 514 (41.3) 166 (39.9) 348 (41.9) X 1 2 =0.468, p=0.49
  1. *Percentages are percentage of group (column) totals.