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Table 1 General characteristics of the study participants

From: Prevalence of autism spectrum disorders and their relation to selected socio-demographic factors among children aged 18–30 months in northern Vietnam, 2017

  Frequency Percentage (%)
City/province
 Ha Noi 5501 31.8
 Thai Binh 5883 34.1
 Hoa Binh 5893 34.1
Area
 Rural 12,754 73.8
 Urban 4523 26.2
Gender
 Girl 8009 46.4
 Boy 9268 53.6
Age (months)
 18–23 7128 41.3
 24–30 10,149 58.7
Mother age
 Less than 29 11,649 67.4
 29 to 39 4061 23.5
 40 and older 1567 9.1
Mother’s education
 Primary education 4908 28.4
 Secondary education 5847 33.8
 High school 3419 19.8
 University/College 3103 18.0
Mother’s occupation
 Government staff 2816 16.3
 Private sector staff 3787 21.92
 Farmer 4378 25.34
 Unstable job 5537 32.05
 Others 759 4.39
Father’s age
 Less than 29 8647 50.1
 29 to 39 7933 45.9
 40 and older 697 4.0
Father’s education
 Primary education 5123 29.7
 Secondary education 6345 36.7
 High school 2756 16.0
 University/College 3053 17.7
Father’s occupation
 Government staff 2421 14.0
 Private sector staff 3037 17.6
 Farmer 3827 22.2
 Unstable job 7484 43.3
 Others 508 2.9
Number of children in the family
 1 6044 35.0
 2 8637 50.0
 3 2596 15.0
Economic status
 Non-poor 15,725 91.0
 Near poor/poor 1552 9.0
Total 17,277 100.0