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Table 1 Baseline characteristics by Newborn Dried Blood Spot Consent Status for Upstate KIDS, New York (2008–2010)

From: Eliciting parental support for the use of newborn blood spots for pediatric research

  Among those returning infant 8-month materials (n = 3696)
  No Consent (n = 589) Consenta (n = 3107)   
N (column %) No. % No. % OR (95 % CI) aOR (95 % CI)
Maternal age       
 <25 years 83 14 415 13 1.00 (reference) 1.00 (reference)
 25 - < 30 years 170 29 779 25 0.92 (0.69–1.22) 0.78 (0.56–1.11)
 30 - < 35 years 179 30 1031 33 1.15 (0.87–1.53) 0.91 (0.63–1.30)
 35 years or older 157 27 882 28 1.12 (0.84–1.50) 0.88 (0.60–1.31)
 Singleton pregnancy 469 80 2420 78 0.90 (0.73–1.12) 0.90 (0.71–1.13)
Maternal race/ethnicity       
 Non-hispanic White 460 78 2602 84 1.00 (reference) 1.00 (reference)
 Non-hispanic Black 23 4 101 3 0.78 (0.49–1.23) 0.68 (0.41–1.14)
 Non-hispanic Asian 11 2 91 3 1.46 (0.78–2.76) 1.64 (0.86–3.13)
 Hispanic 61 10 134 4 0.39 (0.28–0.53) 0.40 (0.28–0.58)
 Mixed / Other 34 6 179 6 0.93 (0.64–1.36) 0.94 (0.63–1.40)
Maternal education       
 Less than high school 33 6 129 4 0.78 (0.52–1.18) 1.04 (0.61–1.78)
 HS or GED equivalent 59 10 330 11 1.12 (0.82–1.54) 1.21 (0.82–1.78)
 Some college 165 28 888 29 1.08 (0.86–1.35) 1.08 (0.84–1.41)
 College 132 22 763 25 1.16 (0.91–1.47) 1.19 (0.92–1.52)
 Advanced degree 200 34 997 32 1.00 (reference) 1.00 (reference)
 Private Insurance 463 79 2476 80 1.07 (0.86–1.33) 1.07 (0.81–1.42)
 Married/Living as married 512 92 2736 91 0.89 (0.64–1.23) 0.81 (0.56–1.16)
 Nulliparous 314 54 1420 46 0.73 (0.61–0.87) 0.71 (0.58–0.87)
 Any alcohol during pregnancy 55 9 422 14 1.52 (1.13–2.05) 1.53 (1.13–2.08)
 Smoked during pregnancy 51 9 345 11 1.32 (0.97–1.79) 1.15 (0.82–1.62)
Infertility treatment       
 None 396 67 2096 67 1.00 (reference) 1.00 (reference)
 Drugs only 106 18 517 17 0.92 (0.73–1.17) 0.95 (0.73–1.23)
 ART 87 15 493 16 1.07 (0.83–1.38) 1.15 (0.86–1.55)
Prepregnancy BMI categories       
 Normal weight (BMI <25) 341 55 1598 49 1.00 (reference) 1.00 (reference)
 Overweight (BMI 25–30) 132 24 757 26 1.22 (0.98–1.52) 1.25 (0.99–1.57)
 Obese (BMI ≥30) 114 21 745 25 1.39 (1.11–1.75) 1.43 (1.12–1.83)
  1. aIncludes: 16 who could not link to newborn screening: 1 singleton, 11 twins, 4 triplets (due to unclear which child of the set); Excludes 18 who had only provided blood spot consent
  2. Bolded for significance (p < 0.05)
  3. aORs adjusted for all other household/maternal factors in the Table
  4. Total N for the models were reduced due to missing information: 1 for specific type of infertility treatment, 2 for insurance status, 126 for marital status, 28 for parity, 2 for alcohol, 2 for smoking, and 9 for BMI