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Table 1 Sample characteristics, by age and group

From: Development of fine motor skills is associated with expressive language outcomes in infants at high and low risk for autism spectrum disorder

  HRA+ HRA− LRC c p (3-group)
Sex (% female) 30.0
n = 30
53.5
n = 71
44.9
n = 69
.09
Race/ethnicity (% White) 83.3
n = 30
95.7
n = 71
88.4
n = 69
.08
a Household income 7.08 (2.02)
n = 24
7.69 (0.91)
n = 67
7.52 (1.38)
n = 58
.79
b Mother’s level of education 5.04 (1.72)
n = 25
5.74 (1.65)
n = 68
6.65 (1.22)
n = 62
.0002***
Actual age at visits (month)
 6 months 5.91 (0.43)
n = 22
5.96 (0.28)
n = 50
5.97 (0.36)
n = 61
.79
 12 months 11.93 (0.45)
n = 30
11.94 (0.38)
n = 67
11.87 (0.42)
n = 67
.54
 18 months 18.12 (0.78)
n = 25
17.91 (0.42)
n = 67
18.01 (0.27)
n = 67
.11
 24 months 24.16 (0.55)
n = 25
24.03 (0.55)
n = 61
24.10 (0.56)
n = 63
.60
 36 months 36.09 (0.68)
n = 22
36.57 (1.50)
n = 51
36.33 (0.64)
n = 54
.20
  1. Data are reported as group means with standard deviations in parentheses
  2. aIncome was reported on an 8-point scale: (1) less than $15,000, (2) $15,000–$25,000, (3) $25,000–$35,000, (4) $35,000–$45,000, (5) $45,000–$55,000, (6) $55,000–$65,000, (7) $65,000–$75,000, (8) more than $75,000
  3. bEducation was reported as the highest level attained on a 9-point scale: (1) some high school, (2) high school graduate, (3) some college, (4) community college/two-year degree, (5) four-year college degree, (6) some graduate school, (7) master’s degree, (8) doctoral degree, (9) professional degree
  4. cFisher’s exact tests were used to determine p values for group differences in sex and race/ethnicity. Kruskal-Wallis tests were used to determine p values for group differences in income and maternal education. One-way ANOVA tests were used to determine p values for group differences in age
  5. ***p < .001