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Table 11 Demographics by recruits by media (paid and free) recruitment

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

 

Free-media (Reference)

Paid-media

  

Postal

Free-to-read print

Transit

Internet

Radio

Trade-specific publications

Paid–to-read print

Birth issues

Maternal characteristics

         

Mean Age (SD)

31.5 (4.6)

30.1 (6.0)

32.3 (4.4)*

31.2 (3.8)

31.5 (4.3)*

30.7 (4.4)

30.9 (4.5)*

30.4 (3.7)

30.9 (4.5)*

 

n = 10

n = 4

n = 27

n = 58

n = 126

n = 50

n = 313

n = 18

n = 479

Above 24 weeks GA

30.00%

25.00%

51.85%

53.45%**

53.54%*

40.00%

55.27%*

72.22%*

53.75%*

 

(3/10)

(1/4)

(14/27)

(31/58)

(68/127)

(20/50)

(173/313)

(13/18)

(258/480)

Mother Caucasian

62.50%

100.00%

95.83%

90.57%

76.64%

85.71%

82.68%

81.25%

81.28%

 

(5/8)

(4/4)

(23/24)

(48/53)

(82/107)

(24/28)

(191/231)

(13/16)

(291/358)

Mother attended post-secondary

55.56%*

100.00%

100.00%

92.59%

90.00%

93.10%

89.79%

100.00%

89.70%

 

(5/9)

(3/3)

(24/24)

(50/54)

(99/110)

(27/29)

(211/235)

(18/18)

(331/369)

Mother reports no current or prior health conditions

25.00%

25.00%

12.50%**

24.53%

24.30%

21.43%

22.08%*

12.50%

22.91%*

(2/8)

(1/4)

(3/24)

(13/53)

(26/107)

(6/28)

(51/231)

(2/16)

(82/358)

Mother has or had asthma

25.00%

0.00%

8.33%**

18.87%

16.82%

32.14%

19.91%

6.25%

21.79%

 

(2/8)

(0/4)

(2/24)

(10/53)

(18/107)

(9/28)

(46/231)

(1/16)

(78/358)

Mother smokes daily or occasionally

0.00%

0.00%

0.00%

5.66%

5.61%

3.57%

6.06%

6.25%

5.03%

(0/8)

(0/4)

(0/24)

(3/53)

(6/107)

(1/28)

(14/231)

(1/16)

(18/358)

Paternal characteristics

         

Father born in Canada

66.67%

30.00%

91.67%

85.71%

86.79%

75.00%

85.44%

33.33%**

83.33%

 

(2/3)

(3/10)

(11/12)

(24/28)

(46/53)

(12/16)

(88/103)

(1/3)

(145/174)

Father attended post-secondary

66.67%

66.67%

75.00%

85.71%

88.68%

81.25%

82.52%

100%

83.91%

 

(2/3)

(2/3)

(9/12)

(24/28)

(47/53)

(13/16)

(85/103)

(3/3)

(146/174)

Father has or had asthma

33.33%

33.33%

33.33%

28.57%

16.98%

37.50%

18.45%

0.00%

24.14%

 

(1/3)

(1/3)

(4/12)

(8/28)

(9/53)

(6/16)

(19/103)

(0/3)

(42/174)

Family characteristics

         

Family income ≥ $80,000

33.33%*

66.67%

77.27%

75.00%

68.93%

60.71%

68.66%

75.00%

66.76%

 

(3/9)

(2/3)

(17/22)

(39/52)

(71/103)

(17/28)

(149/217)

(12/16)

(231/346)

Family income ≥ $40,000

77.78%

66.67%

95.45%

96.15%

93.20%

89.29%

94.93%

100%

92.49%

 

(7/9)

(2/3)

(21/22)

(50/52)

(96/103)

(25/28)

(206/217)

(16/16)

(320/346)

Married /Common law

77.78%*

100.00%

100.00%

97.74%

95.12%

95.83%

93.79%

100.00%

93.56%

 

(7/9)

(4/4)

(27/27)

(54/57)

(117/123)

(46/48)

(287/306)

(17/17)

(436/466)

  1. Analyses controlled for the number of concurrent advertisements active.
  2. *p ≤ 0.05 ; **p ≤ 0.08.