Table 1 Characteristics of the analytic sample
|  | Full analytic sample (n = 943) | Sample by quartile of NDVI in 300 m | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Q1 (n = 230) | Q2 (n = 230) | Q3 (n = 229) | Q4 (n = 230) | |||||||
Child variables | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Categorical | n | (%) | n | (%) | n | (%) | n | (%) | n | (%) |
Boys | 465 | (49) | 115 | (50) | 113 | (49) | 108 | (47) | 120 | (52) |
Girls | 478 | (51) | 115 | (50) | 117 | (51) | 121 | (53) | 110 | (48) |
Preterm birth | 83 | (9) | 20 | (9) | 17 | (7) | 26 | (11) | 19 | (8) |
SHS exposure | 287 | (31) | 71 | (31) | 74 | (32) | 67 | (30) | 65 | (28) |
Continuous | mean | (SD) | mean | (SD) | mean | (SD) | mean | (SD) | mean | (SD) |
Age (yrs) | 4.3 | (0.4) | 4.3 | (0.4) | 4.3 | (0.4) | 4.3 | (0.4) | 4.3 | (0.4) |
Physical activity | 1.6 | (0.7) | 1.5 | (0.8) | 1.7 | (0.7) | 1.6 | (0.7) | 1.6 | (0.7) |
Screen time | 2 | (4.2) | 1.8 | (3.7) | 2.1 | (4.2) | 2 | (4.3) | 2 | (4.6) |
Maternal and household variables | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Categorical | n | (%) | n | (%) | n | (%) | n | (%) | n | (%) |
Maternal race | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
  Black | 611 | (65) | 166 | (72) | 156 | (68) | 151 | (66) | 123 | (53) |
  White | 273 | (29) | 46 | (20) | 61 | (27) | 67 | (29) | 94 | (41) |
  Another race or multiple races | 59 | (6) | 18 | (8) | 13 | (6) | 11 | (5) | 13 | (6) |
Maternal education | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
  <High school | 52 | (6) | 8 | (3) | 15 | (7) | 7 | (3) | 20 | (9) |
  High school degree | 376 | (40) | 93 | (40) | 100 | (44) | 94 | (41) | 81 | (36) |
  Technical school | 124 | (13) | 30 | (13) | 29 | (13) | 38 | (17) | 21 | (9) |
  College degree | 237 | (25) | 65 | (28) | 53 | (24) | 52 | (23) | 61 | (27) |
  Graduate/prof degree | 147 | (16) | 34 | (15) | 28 | (12) | 38 | (17) | 45 | (20) |
Maternal smoking during pregnancy | 81 | (9) | 8 | (3) | 25 | (11) | 21 | (9) | 22 | (10) |
Near road | 264 | (28) | 83 | (36) | 77 | (34) | 55 | (24) | 43 | (19) |
Continuous | mean | (SD) | mean | (SD) | mean | (SD) | mean | (SD) | mean | (SD) |
Adjusted HH income (USD) | 17,903 | (13,514) | 17,129 | (13,224) | 17,302 | (13,170) | 17,932 | (13,699) | 19,697 | (13,973) |
Maternal IQ percentile | 40.3 | (30.7) | 40.2 | (29.4) | 36.7 | (29.8) | 40.7 | (31.4) | 44.1 | (32.4) |
Maternal depression score | 8.6 | (7.2) | 9 | (8.4) | 9 | (7.2) | 7.8 | (6.3) | 8.2 | (6.8) |
PRQ attachment score | 52.9 | (9.7) | 53.3 | (9.9) | 53.2 | (10.1) | 52.3 | (9.2) | 52.5 | (9.8) |
Neighborhood COI scales | mean | (SD) | mean | (SD) | mean | (SD) | mean | (SD) | mean | (SD) |
Socioeconomic | -0.113 | (0.260) | -0.131 | (0.271) | -0.116 | (0.257) | -0.106 | (0.238) | -0.101 | (0.272) |
Education | -0.047 | (0.068) | -0.047 | (0.063) | -0.052 | (0.063) | -0.05 | (0.064) | -0.037 | (0.079) |