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Table 1 Frequency distribution of demographic variables of the study participants

From: Predictors of oral health-related quality of life in 2–5 year-old children in the South of Iran

Variable Item Absolute frequency Relative frequency (%)
Respondents Mother 238 82.6
Father 46 16
Child’s caregiver 4 1.4
Child’s age 24–35 months 73 25.3
36–47 months 81 28.1
48–59 months 79 27.4
60–71 months 55 19.2
Child’s gender Female 148 51.4
Male 140 48.6
Birth order First-born 179 62.2
Second-born 87 30.2
Third-born and higher 22 7.6
Number of children in a family Only child 112 38.9
2–3 children 160 55.6
4–5 children 16 5.5
Parental age
 Father Below 30 years old 30 10.4
31–40 years old 208 72.2
41–50 years old 44 15.3
Over 50 years old 6 2.1
 Mother Below 30 years old 121 42
31–40 years old 159 55.2
41–50 years old 8 2.8
Level of education
 Father Primary school 18 6.2
Middle school 53 18.4
High school diploma 105 36.5
Associate’s degree 21 7.3
Bachelor’s degree 67 23.3
Master’s degree and higher 24 8.3
 Mother Primary school 12 4.2
Middle school 19 6.6
High school diploma 106 36.8
Associate’s degree 23 8
Bachelor’s degree 109 37.8
Master’s degree and higher 19 6.6
Father’s occupation Employee 82 28.5
Worker 37 12.8
Self-employed 159 55.2
Retired 2 0.7
Other 8 2.8
Mother’s occupation Housewife 237 82.3
Work from home 4 1.4
Employed outside the home 42 14.6
Other 5 1.7