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. 2023 Jan 17;94(2):564–574. doi: 10.1038/s41390-022-02415-y

Table 1.

Study sample characteristics.

Variable Phase-I Phase-II p
Summary statistic Summary statistic
Child age in months, M (SD) 24.96 (18.32) 12.83 (8.51) p < 0.001
Child sex
 Male 74 (52.1%) 70 (48.3%) 0.578
 Female 68 (47.9%) 75 (51.7%)
Ethnicity
 Hispanic 76 (53.9%) 45 (31.7%) 0.728
 White 42 (29.8%) 69 (48.6%)
 Black 13 (9.2%) 18 (12.7%)
 Other (Asian, Native Hawaiian, or Pacific Islander) 10 (7.1%) 10 (7.0%)
Family household income
 <$15,000 per year 22 (15.5%) 3 (3.1%) p < 0.001
 $15,001–$30,000 per year 24 (16.9%) 38 (39.2%)
 $30,001–$60,000 per year 30 (21.1%) 12 (12.4%)
 $60,001–$90,000 per year 11 (7.7%) 11 (11.3%)
 ≥$90,001 per year 42 (29.6%) 33 (34.0%)
Maternal education
 Some high school or less 29 (20.4%) 27 (19.4%) 0.592
 General education diploma or High school diploma 29 (20.4%) 31 (22.3%)
 Some college or complete community college 28 (19.0%) 25 (18.0%)
 Four-year degree or some graduate school 26 (18.3%) 17 (12.2%)
 Master’s degree or higher 26 (18.3%) 39 (28.1%)