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Table 2 Differences in demographic characteristics of responders and non-responders, overall and by recruitment strategy (n = 13,251)

From: A randomized trial of mail and email recruitment strategies for a physician survey on clinical trial accrual

 Overall (n = 13,251)Mail-based recruitment (n = 6526)Email-based recruitment (n = 6725)
Responder (n = 1072)Non-responder (n = 12,179)p-valueResponder (n = 770)Non-responder (n = 5756)p-valueResponder (n = 302)Non-responder (n = 6423)p-value
n%n% n%n% n%n% 
Age (years)    < 0.01    < 0.01    < 0.01
 25–343212.422687.6 1915.710284.3 139.512490.5 
 35–4440610.6342389.4 28414.9162485.1 1226.4179993.7 
 45–542947.4367092.6 21711.1174288.9 773.8192896.2 
 55–642316.9311193.1 16510.1146489.9 663.9164796.2 
 65+1095.9174994.1 859.482490.7 242.592597.5 
Sex    0.01    0.09    0.03
 Male7808.5837091.5 55512.3397587.8 2254.9439595.1 
 Female2927.1380992.9 21510.8178189.2 773.7202896.3 
Medical specialty    < 0.01    < 0.01    0.24
 Medical oncology6467.0853193.0 4479.8410090.2 1994.3443195.7 
 Radiation oncology37810.2334289.8 28815.8153284.2 904.7181095.3 
 Surgical oncology4813.630686.4 3522.012478.0 136.718293.3 
Geographic region    0.10    0.25    0.40
 West2268.5242191.5 16512.6115087.5 614.6127195.4 
 Midwest2408.4263391.7 16911.6128388.4 715.0135095.0 
 Northeast2167.0285893.0 15710.4134789.6 593.8151196.2 
 South3908.4426791.6 27912.4197687.6 1114.6229195.4 
  1. NOTE: Row percentages displayed in table; p-values compare responder to non-responder within each category: overall, mail-based recruitment, and email-based recruitment