. Author manuscript; available in PMC: 2023 Feb 1.

Published in final edited form as: Dev Psychopathol. 2021 Jan 26;34(3):854–863. doi: 10.1017/S0954579420001662

Table 1.

Characteristics of the study sample by trajectories of social communication deficits

Variable	Total sample (n = 804)	Social communication deficits trajectories
Variable	Total sample (n = 804)	High (n = 80)	Low (n = 724)	p value for difference
Sex (n = 804): % boys	48.9	58.8	47.7	.059
Risk exposures
Cumulative risk (n = 804): score	−0.31 (0.72)	−0.30 (0.91)	−0.31 (0.72)	.847
Maternal smoking (n = 798): % yes	12.2	13.9	11.8	.586
Child characteristics
Conduct problems (n = 793): score	−0.30 (1.26)	1.34 (1.64)	−0.43 (1.04)	<.001
Hyperactivity/inattention (n = 792): score	−0.48 (2.53)	1.80 (3.11)	−0.56 (2.32)	<.001
Emotional difficulties (n = 792): score	−0.44 (1.26)	0.06 (2.05)	−0.47 (1.20)	.001
Peer problems (n = 793): score	−0.38 (1.02)	0.13 (2.02)	−0.45 (0.94)	<.001
IQ (n = 768)	107.32 ± 15.61	103.95 ± 19.68	107.70 ± 15.04	.215

Note: Values represent median (interquartile range) or mean ± SD unless otherwise specified; p values are derived from chi-square tests (categorical variables) or Mann–Whitney–Wilcoxon tests (continuous variables).