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Table 1 Descriptions of primary variables at both individual and assessment levels

From: Heart rate-defined sustained attention in infants at risk for autism

 

High familial risk (n = 21)

Low familial risk (n = 21)

 

n

\( \overline{X} \)

SD

min

max

n

\( \overline{X} \)

SD

min

max

Individual-level variables

 n assessments

21

1.76

0.83

1

3

21

1.71

0.78

1

3

 MSEL Early Learning Score

21

97.62

16.26

60

137

21

102.86

10.96

80

117

 ADOS Severity Score

20

3.95

2.76

1

10

–

–

–

–

–

Assessment-level variables

 Age in months

37

9.80

2.43

5.98

13.41

36

10.23

2.23

5.69

13.74

 Proportion time inattentive

37

0.40

0.25

0.08

0.95

36

0.43

0.22

0.03

0.81

 Proportion time in HRDSA

37

0.30

0.21

0.00

0.92

36

0.30

0.21

0.06

0.95

 IBI change during HRDSA

34

33.38

23.53

3.96

110.47

36

36.02

22.52

3.56

130.15

  1. Individual-level variables are measured on one occasion per individual, and assessment-level variables are collapsed across all assessments and individuals in each group
  2. ADOS Autism Diagnostic Observation Schedule, HRDSA heart rate-defined sustained attention, IBI interbeat interval, MSEL Mullen Scales of Early Learning