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Table 5 Demographics of recruits by recruitment method among CHILD study participants

From: You are how you recruit: a cohort and randomized controlled trial of recruitment strategies

  Fax Tradeshow Direct In-clinic Paid-media Free-media
  (Reference)      
Maternal characteristics   
Mean age (SD) 31.0 (4.3) 31.2 (4.3) 33.3 (5.5) 30.8 (4.7) 30.3 (4.9) 32.4 (5.0)
n = 267 n = 90 n = 12 n = 387 n = 26 n = 14
Above 24 weeks GA 47.43% 54.95% 68.75% 54.64%* 26.92%* 35.29%*
(129/272) (50/91) (11/16) (212/388) (7/26) (6/17)
Mother Caucasian 85.90% 85.14% 90.00% 78.18%* 82.35% 88.24%
(195/227) (63/74) (9/10) (240/307) (14/17) (15/17)
Mother attended post-secondary 92.63% 91.78% 90.00% 89.78% 94.44% 82.35%
(176/190) (67/73) (9/10) (281/313) (17/18) (14/17)
Mother has or had asthma 20.26% 22.97% 30.0% 23.45% 23.53% 47.06%*
(46/227) (17/74) (3/10) (72/307) (4/17) (8/17)
Mother smokes daily or occasionally 6.84% 1.35% 0.00% 4.23% 17.65% 5.88%
(13/190) (1/74) (0/10) (13/307) (3/17) (1/17)
Paternal characteristics   
Father born in Canada 89.23% 74.19%* 100.00% 79.75%* 88.89% 80.00%
(116/130) (23/31) (6/6) (126/158) (8/9) (8/10)
Father attended post-secondary 86.26% 90.32% 100.00% 78.48% 88.89% 90.00%
(113/131) (28/31) (6/6) (124/158) (8/9) (9/10)
Father has or had asthma 26.92% 25.81% 33.33% 20.89% 22.22% 10.00%
(35/130) (8/31) (2/6) (33/158) (2/9) (1/10)
Family characteristic  
Family income ≥ $40,000 95.73% 95.65% 90.00% 88.77%* 94.44% 93.33%
  (202/211) (66/69) (9/10) (253/285) (17/18) (14/15)
Married/common law 97.70% 92.31%* 100.00% 93.39%* 88.00%* 88.24%
  (255/261) (84/91) (16/16) (353/378) (22/25) (15/17)
  1. *p ≤ 0.05.