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. Author manuscript; available in PMC: 2021 Jul 1.
Published in final edited form as: Child Dev. 2019 Oct 8;91(4):e762–e779. doi: 10.1111/cdev.13315

Table 1.

Means and standard deviations of all study variables

Measure Mean (SD) Range
Income $112,530 $64,961 $5000 - $250,000
Income-to-Needs 4.73 2.86
Education 4.04 1.05 10 – 22
Violence Exposure 3.00 3.90 0 – 20
Cognitive Stimulation (total score) 15.69 3.07 5 – 20
Total Number of Words 662.07 221.81 291 – 1270
Mean Length Utterance 4.57 .81 1.71 – 7.10
Total Number of Different Words 212.44 48.83 43 – 331
Backwards Digit Span Total Points (Time 1) 3.68 2.04 0 – 8
Backwards Digit Span Total Points (Time 2) 5.68 1.80 2 – 11
Simon Says Inhibition Total Points (Time 1) 17.31 10.02 0 – 30
Simon Says Inhibition Total Points (Time 2) 24.04 5.39 0 – 30
Dimensional Card Sort Highest Level Passed (Time 1) 2.91 0.90 1 – 4
Dimensional Card Sort Highest Level Passed (Time 2) 3.57 0.68 1 – 4
Academic Achievement 100.42 13.39 71–141