Table 4.

Causes of language developmental delay and average age of language delay

			Number of children	Average age of language delay (mo)	p-valuea)
Causes of language developmental delay					0.000*
	Mental retardation		215 (20.5)	23.69±8.94
	Specific language impairment		118 (11.2)
		Mixed receptive–expressive language disorder	110 (10.5)	18.18±9.11
		Expressive language disorder	8 (0.76)	24.37±7.93
	Autism spectrum disorder		54 (5.14)	31.12±13.25

Values are presented as number of children (%) or mean±standard deviation.

^a)Using the Kruskal–Wallis test.

^*p<0.05.