. 2019 Apr 29;13:29. doi: 10.1186/s13033-019-0285-8

Table 2.

Prevalence of ASD among children aged 18 and 30 months

	Count	Percentage (%)	Lower bound of 95% CI (%)	Upper bound of 95% CI (%)
City/province
Ha Noi	46	0.836	0.613	1.114
Thai Binh	41	0.697	0.501	0.944
Hoa Binh	43	0.730	0.529	0.982
Area
Rural	74	0.580	0.456	0.728
Urban	56	1.238	0.937	1.605
Gender
Girl	23	0.287	0.182	0.431
Boy	107	1.155	0.947	1.393
Age (months)
18–23	55	0.772	0.582	1.003
24–30	75	0.739	0.582	0.925
Mother age
Less than 29	81	0.695	0.553	0.864
29 to 39	41	1.010	0.725	1.367
40 and older	8	0.511	0.221	1.003
Mother’s education
Primary education	32	0.652	0.461	0.921
Secondary education	46	0.787	0.590	1.049
High school	32	0.936	0.663	1.321
University/College	20	0.645	0.416	0.997
Mother’s occupation
Government staff	14	0.497	0.272	0.833
Private sector staff	30	0.792	0.535	1.129
Farmer	36	1.054	0.577	1.137
Unstable job	42	0.759	0.547	1.024
Others	8	0.822	0.456	2.066
Father’s age
Less than 29	53	0.613	0.459	0.801
29 to 39	72	0.908	0.711	1.142
40 and older	5	0.717	0.233	1.666
Father’s education
Primary education	31	0.605	0.426	0.859
Secondary education	50	0.788	0.598	1.038
High school	25	0.907	0.614	1.339
University/College	24	0.786	0.527	1.170
Father’s occupation
Government staff	13	0.537	0.286	0.916
Private sector staff	27	0.889	0.587	1.291
Farmer	18	0.470	0.279	0.742
Unstable job	65	0.869	0.671	1.106
Others	7	1.378	0.556	2.818
Number of children in the family
1	39	0.645	0.459	0.881
2	69	0.799	0.622	1.010
3	22	0.847	0.532	1.280
Economic status
Non-poor	118	0.750	0.622	0.898
Near poor/poor	12	0.773	0.400	1.347
Total	130	0.752	0.629	0.893