Table 1.
N (%) of demographic characteristics among participants in the LIFECODES Fetal Growth Study (n = 900)
| Variable | n (%) |
|---|---|
| Age at enrollment | |
| < 25 yrs | 102 (11) |
| 25 0 – 29.9 yrs | 187 (21) |
| 30.0 – 34.0 yrs | 304 (35) |
| ≥ 35.0 yrs | 307 (34) |
| Pre-pregnancy BMI | |
| < 25.0 kg/m2 | 462 (53) |
| 25.0 – 29.9 kg/m2 | 211 (25) |
| ≥ 30.0 kg/m2 | 216 (23) |
| Education | |
| High school or less | 120 (13) |
| Some college or technical school | 179 (21) |
| College or greater | 587 (66) |
| Race and ethnicity | |
| NH White | 517 (58) |
| NH Black | 136 (14) |
| Hispanic | 147 (16) |
| Asian | 56 (6) |
| Multiple race/Other | 44 (6) |
| Insurance provider | |
| Private/HMO | 638 (73) |
| Public/Self-pay/None | 252 (27) |
| Alcohol consumption during pregnancy | |
| No | 837 (93) |
| Yes | 55 (7) |
| Smoking during pregnancy | |
| No | 843 (93) |
| Yes | 57 (7) |
| Use of ART to conceive | |
| No | 790 (88) |
| Yes | 110 (12) |
| Parity | |
| 0 | 344 (38) |
| 1 | 353 (40) |
| 2 | 142 (16) |
| 3+ | 61 (6) |
| Infant sex | |
| Female | 422 (48) |
| Male | 478 (52) |
| Year of conception | |
| 2007 – 2008 | 217 (25) |
| 2009 – 2010 | 139 (17) |
| 2011 – 2012 | 267 (30) |
| 2013 – 2014 | 129 (15) |
| 2015 – 2016 | 94 (8) |
| 2017 – 2018 | 54 (5) |
Abbreviations: ART = assisted reproductive technologies, BMI = body mass index, NH = non-Hispanic
Note: number of missing observations (%) per variable: pre-pregnancy BMI, n = 11 (1%); education, n =14 (2%); insurance provider, n = 10 (1%), alcohol consumption, n = 8 (1%).