Table 3

Participation of parents invited to participate in the HOEPS pilot, by survey instrument and case or control status
Distribution of demographic characteristics Participation rate
Eligible Participated
MQ CATI MQ CATI MQ CATI
(n = 195) (n = 197) (n = 148) (n = 120) (n = 148) (n = 120)
N (%) N (%) N (%) N (%) % %
Case status
 Cases 94 (48.2) 95 (48.2) 73 (49.3) 65 (54.2) 77.7 68.4
 Controls 101 (51.8) 102 (51.8) 75 (50.7) 55 (45.8) 74.3 53.9
Center
 Iowa 123 (63.1) 123 (62.4) 92 (62.2) 78 (65.0) 74.8 63.4
 New York 72 (36.9) 74 (37.6) 56 (37.8) 42 (35.0) 77.8 56.8
Mother’s age at conception
 <20 years 17 (8.7) 15 (7.6) 10 (6.8) 7 (5.8) 58.8 46.7
 20-24 years 49 (25.1) 45 (22.8) 36 (24.3) 24 (20.0) 73.5 53.3
 25-29 years 56 (28.7) 60 (30.5) 42 (28.4) 40 (33.3) 75.0 66.7
 30-34 years 49 (25.1) 57 (28.9) 39 (26.4) 34 (28.3) 79.6 59.6
 ≥35 years 24 (12.3) 20 (10.2) 21 (14.2) 15 (12.5) 87.5 75.0
Mother’s race/ethnicity
 White, non-Hispanic 171 (87.7) 176 (89.3) 134 (90.5) 108 (90.0) 78.4 61.4
 Other race 21 (10.8) 21 (10.7) 13 (8.8) 12 (10.0) 61.9 57.1
 Missing/Unknown 3 (1.5) 0 (0.0) 1 (0.7) 0 (0.0) NC NC
Mother’s education
 <12 years, or did not complete high school (HS) 12 (6.2) 11 (5.6) 6 (4.1) 5 (4.2) 50.0 45.5
 12 years, completed HS, or equivalent 38 (19.5) 43 (21.8) 27 (18.2) 25 (20.8) 71.1 58.1
 1-3 years college, or completed technical college 70 (35.9) 68 (34.5) 53 (35.8) 37 (30.8) 75.7 54.4
 ≥4 years of college; bachelor's degree or higher 75 (38.5) 75 (38.1) 62 (41.9) 53 (44.2) 82.7 70.7
Family’s annual income
 <$20,000 36 (18.5) 42 (21.3) 24 (16.2) 22 (18.3) 66.7 52.4
 $20,000 - $39,999 53 (27.2) 52 (26.4) 39 (26.4) 32 (26.7) 73.6 61.5
 ≥$40,000 100 (51.3) 98 (49.7) 80 (54.1) 63 (52.5) 80.0 64.3
 Missing 6 (3.1) 5 (2.5) 5 (3.4) 3 (2.5) 83.3 60.0
Mother smoked
 Yes 56 (28.7) 49 (24.9) 37 (25.0) 21 (17.5) 66.1 42.9
 No 139 (71.3) 147 (74.6) 111 (75.0) 98 (81.7) 79.9 66.7
 Missing 0 (0.0) 1 (0.5) 0 (0.0) 1 (0.8) NC NC
Parity
 Primiparous 87 (44.6) 69 (35.0) 67 (45.3) 41 (34.2) 77.0 59.4
 Multiparous 108 (55.4) 127 (64.5) 81 (54.7) 78 (65.0) 75.0 61.4
 Missing 0 (0.0) 1 (0.5) 0 (0.0) 1 (0.8) NC NC
Infant birthweight
 <2500 g 21 (10.8) 24 (12.2) 15 (10.1) 9 (7.5) 71.4 37.5
 ≥2500 g 172 (88.2) 170 (86.3) 132 (89.2) 109 (90.8) 76.7 64.1
 Missing 2 (1.0) 3 (1.5) 1 (0.7) 2 (1.7) NC NC

NC not calculated.

Rocheleau et al.

Rocheleau et al. BMC Public Health 2012 12:579   doi:10.1186/1471-2458-12-579

Open Data