Table 5 Logistic regression analysis of associated factors related to caries status among a sample of 12–15 years old in Gansu province of China

Gender

 Female

0.257

0.070

13.662

1.294 (1.129–1.483)

 < 0.001

 Male

–

–

–

–

–

District

 Rural

0.868

0.073

140.331

2.381 (2.063–2.749)

 < 0.001

 Urban

–

–

–

–

–

Age (years)

 15

0.446

0.100

19.811

1.562 (1.284–1.901)

 < 0.001

 14

0.494

0.099

24.818

1.638 (1.349–1.989)

 < 0.001

 13

0.136

0.101

1.837

1.146 (0.941–1.396)

0.175

 12

–

–

–

–

–

Only children

 No

0.247

0.124

3.956

1.280 (1.004–1.633)

0.047

 Yes

–

–

–

–

–

Frequency of sweets consumption

 Rarely

0.099

0.343

0.082

1.104 (0.563–2.164)

0.774

 1 to 4 times a month

0.328

0.318

1.063

1.388 (0.744–2.589)

0.303

 2 to 7 times a week

0.311

0.320

0.947

1.365 (0.730–2.533)

0.330

  ≥ 2 times a day

–

–

–

–

–

The time of recent dental visit

 Within 6 months

0.759

0.171

19.788

2.136 (1.529–2.983)

 < 0.001

 6 to 12 months

0.530

0.142

13.976

1.699 (1.287–2.243)

 < 0.001

 More than 12 months

0.487

0.105

21.472

1.627 (1.324–2.000)

 < 0.001

 Never

–

–

–

–

–

Toothache experience

 Often

1.343

0.199

45.426

3.831 (2.592–5.661)

 < 0.001

 Occasionally

0.459

0.088

27.089

1.582 (1.331–1.881)

 < 0.001

 Can’t remember

− 0.033

0.105

0.051

0.968 (0.729–1.285)

0.821

 Never

–

–

–

–

–