Table 1 Specification of the research sample.

From: Polish multichannel audio-visual child speech dataset with double-expert sigmatism diagnosis

Age (years)

Average age (months)

Number of children

Girls

Boys

Total

4–5

58.7 ± 0.6

1

2

3

5–6

66.6 ± 3.4

37

23

60

6–7

77.7 ± 3.6

48

48

96

7–8

87.9 ± 3.5

21

21

42

Aggregated

76.2 ± 8.6

107

94

201