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Table 2 Comparisons of HC, weight, and height across groups from birth to the age of 24 months in 3-month intervals

From: No evidence of early head circumference enlargements in children later diagnosed with autism in Israel

Head circumference
Age Autism Control Autism-control t value p value
Birth 34.4 35 −0.6 −2.1 0.04*
3 months 39.7 40.2 −0.5 −2.8 0.006*
6 months 42.8 43.2 −0.4 −1.7 0.1
9 months 44.7 44.9 −0.2 −1.3 0.19
12 months 45.9 46.2 −0.3 −1.3 0.21
15 months 46.7 47.1 −0.4 −1.7 0.1
18 months 47.2 47.7 −0.5 −1.9 0.06
21 months 47.7 48.3 −0.6 −1.4 0.17
24 months 48.1 49.1 −1 −1.8 0.12
Weight
Age Autism Control Autism-control t value p value
Birth 3.2 3.4 −0.2 −2.7 0.007*
3 months 5.6 6.1 −0.5 −3.8 0.0004*
6 months 7.6 7.9 −0.3 −1.9 0.06
9 months 8.7 9 −0.3 −1.4 0.1
12 months 9.7 9.9 −0.2 −1.2 0.24
15 months 10.4 10.6 −0.2 −0.9 0.36
18 months 11.1 11.3 −0.2 −1 0.31
21 months 11.7 12 −0.3 −1.1 0.28
24 months 12.3 12.5 −0.2 −1 0.31
Height
Age Autism Control Autism-control t value p value
3 months 59.4 60 −0.6 −1.9 0.06
6 months 66.9 67.3 −0.4 −1.2 0.24
9 months 71.5 71.8 −0.3 −1.4 0.58
12 months 75.5 75.3 0.2 −1.2 0.73
15 months 78.8 78.5 0.3 −0.9 0.53
18 months 81.7 81.5 0.2 −1 0.72
21 months 84.5 84.2 0.3 −1.1 0.63
24 months 87 86.7 0.3 −1 0.67
  1. HC and height are in centimeters and weight is in kilograms. Columns: mean of the autism group, mean of the control group, the difference between autism and control groups, t values, and p values from a two-tailed two-sample t test with unequal variance. p values are not corrected to increase sensitivity
  2. Asterisks: p value < 0.05