Table 2 Univariate and multivariate analysis

Examiner’s initiation and children’s response

1

RE1

Proportion of times children respond to the examiner 's initiation

Proportion

0

0–0.001

0

Eye gaze

2

EC1

Total counts of eye gaze

Count

0.681

0.619–0.751

0

0.684 ~ 0.885

 < 0.001

3

EC3

Total duration of eye gaze

Duration

0

0–0

0

4

EC5

Counts of eye gaze coordinated with facial expression, vocalization, or gesture

Count

0.736

0.634–0.855

0

Pointing with coordinated gaze to object

5

PT2

Total counts of standard pointing with coordinated gaze to object (pointing to a specific direction using any finger, with flexion of the remaining fingers)

Count

0.184

0.12–0.282

0

6

PT3

Counts of standard pointing with coordinated gaze to object divided by the total counts of pointing with coordinated gaze to object

Proportion

0.019

0.006–0.061

0

0.001 ~ 0.072

 < 0.001

Facial expression

7

FE2

Total counts of appropriate facial expressions

Count

0.584

0.467–0.73

0

0.466 ~ 0.92

0.023

8

FE3

Counts of appropriate facial expressions divided by the total counts of facial expressions

Proportion

0.303

0.179–0.512

0

9

FE4

Counts of basic facial expressions

Count

0.657

0.541–0.798

0

Vocalization and verbalization

10

VO1

Total counts of vocalizations and verbalizations (excluding sneeze, cough, or other vocalizations caused by physiological reflexes)

Count

1.158

1.046–1.283

0.005

11

VO4

Counts of socially oriented vocalizations and verbalizations

Count

1.158

1.046–1.283

0.005

12

VO7

Counts of socially oriented vocalizations and verbalizations divided by the total counts of vocalizations and verbalizations

Proportion

1.111

1.054–1.171

0

1.162 ~ 1.446

 < 0.001

13

VO8

Duration of socially oriented vocalizations and verbalizations divided by the total duration of vocalizations and verbalizations

Proportion

1.133

0.683–1.878

0.629

14

VO9

Counts of vocalization and verbalizations using words

Count

1.042

0.938–1.157

0.442

15

VO10

Counts of vocalizations and verbalizations using words divided by the total counts of vocalizations and verbalizations

Proportion

1.112

0.67–1.846

0.683

Giving

16

GV1

Total counts of giving behaviors

Count

0.313

0.242–0.405

0

17

GV2

Counts of spontaneous giving behaviors

Count

0.649

0.4–1.053

0.08

18

GV3

Counts of children using giving behaviors to respond to the examiner's initiations

Count

0.248

0.185–0.333

0

19

GV4

Counts of children using giving behaviors to respond to the examiner's initiations divided by the total counts of the examiner's initiation of snack requisitions

Proportion

0.015

0.006–0.035

0

0.006 ~ 0.083

 < 0.001

20

GV5

Counts of spontaneous giving behaviors divided by the total counts of giving behaviors

Proportion

0.66

0.149–2.915

0.583