Table 2.
Characteristics of n = 95 participants with fNIRS data in the CHAM2 study, enrolled 2009 in Salinas Valley, California
| fNIRS participants (n = 95) | Nonparticipants (n = 214) | |||
| Characteristics | n | (%) | n | (%) |
| Maternal age at delivery,* y | ||||
| 17–24 | 32 | (33.7) | 93 | (44.3) |
| 25–29 | 19 | (20.0) | 65 | (31.0) |
| 30–34 | 27 | (28.4) | 36 | (17.1) |
| 35–45 | 17 | (17.9) | 16 | (7.6) |
| Maternal education† | ||||
| ≤Sixth grade | 41 | (43.1) | 81 | (39.1) |
| Some middle/high school | 26 | (27.4) | 69 | (33.3) |
| High school graduate | 28 | (29.5) | 57 | (27.5) |
| Family poverty level at 14 y | ||||
| ≤100% federal poverty level | 71 | (74.7) | 155 | (77.1) |
| >100% federal poverty level | 24 | (25.3) | 46 | (22.9) |
| Child’s sex | ||||
| Female | 49 | (51.6) | 97 | (45.3) |
| Male | 46 | (48.4) | 117 | (54.7) |
| Child’s age at assessment, y | ||||
| 15 | 54 | (56.8) | N/A | |
| 16 | 40 | (42.1) | ||
| 17 | 1 | (1.1) | ||
| Child’s handedness | ||||
| Right | 89 | (93.7) | N/A | |
| Left | 6 | (6.3) | ||
| Child’s self-reported substance use (alcohol or marijuana use) in previous 24 h of fNIRS | ||||
| No | 87 | (91.6) | N/A | |
| Yes | 8 | (8.4) | ||
N/A, not applicable.
*
Distribution different between participants and nonparticipants (P < 0.01).
†
Imputed maternal education for 1 participant using data collected at another time point.