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["Survey questionnaire"]
["1. Socio-demographic information"]
["1.1 Gender"]
["1.2 Age"]
["1.3 Districts/counties (Guang’an, Chuanshan, and Jinniu Districts, Yibin, Da, and Pi Counties)"]
["1.4 Region (urban/rural)"]
["1.5 Father/mother’s education level "]
["(illiterate/low: primary school/medium: junior high school/ high: high school or above)"]
["1.6 Only child (yes/no) "]
["2. Oral hygiene knowledge (Correct/Wrong/Don’t know)"]
["2.1 It is normal for your gums to bleed while brushing your teeth"]
["2.2 Bacteria can cause inflammation of the gums"]
["2.3 Brushing your teeth does nothing to prevent gum inflammation"]
["2.4 Bacteria can cause tooth decay"]
["2.5 Eating sugar can lead to tooth decay"]
["2.6 Fluoride can protect teeth"]
["2.7 Pit and fissure sealing can protect teeth"]
["2.8 Oral diseases may affect general health"]
["3. Oral hygiene attitude (Agree/ Disagree/ Perhaps/ Don’t know)"]
["3.1 Regular dental check is necessary "]
["3.2 Oral health is very important to life"]
["3.3 The quality of teeth is innate and has little to do with their own care"]
["3.4 Prevention of dental disease depends on yourself first"]
["4. Oral hygiene behaviors "]
["4.1 Brushing (once a day/once a day/ once a day/never)"]
["4.2 Toothpaste use (Yes/No)"]
["5. Dietary habits (Never, seldom; 1–3 times/month; Once/week; 2–6 times/week; Once/day; >=2 times/day)"]
["5.1 Candy/chocolate/cookies/cakes"]
["5.2 Carbonated beverages (cola for instance)"]
["5.3 Sugary drinks (sugary milk for instance)"]
["6. Subjective health conditions (Very good/ Good/ Average/ Poor/ Very poor)"]
["6.1 Self-assessment of oral health status "]
["6.2 Self-assessment of general health status "]
["7. History of dental trauma (Yes/ No/ Don’t remember)"]
["8. Frequency of toothache in the previous 12 months (Often/ Occasionally/ Never/ Don’t remember)"]
["9. Dental visit"]
["9.1 History of dental visits (Yes/ No)"]
["9.2 Reason for last dental visit (Never/ Consultation/ Prevention/ Treatment/ Don’t know)"]
["9.3 Time of last dental visit (Never/ <6 months ago/ 6–12 months ago/ >12 months ago)"]
["10. Oral impacts on daily performances (Serious/ General/ Slight/ None/ Don’t know)"]
["10.1 Impact on eating"]
["10.2 Impact on talking"]
["10.3 Impact on brushing"]
["10.4 Impact on working"]
["10.5 Impact on schooling"]
["10.6 Impact on sleeping"]
["10.7 Impact on grinning"]
["10.8 Impact on easily troubled"]
["10.9 Impact on communicating"]