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Table 2 Comparison of the socio-demographic bariables and permanent tooth emergence between the included and excluded students

From: Association of infant growth with emergence of permanent dentition among 12 year-aged southern Chinese school children

Characteristics Included (n = 485) Excluded (n = 29) p
Gendera    0.195
 Female 50.3 37.9  
 Male 49.7 62.1  
Weight for age z-score; mean (SD)
 Birth −0.17 (0.91) −1.77 (1.68) < 0.001***
 3 months 0.10 (0.85) −0.67 (1.16) < 0.001***
 12 months 0.06 (0.87) −0.37 (0.96) 0.014
Gestational age (weeks)a   
 37 7.8  
 38 22.3  
 39 29.9  
 40 26.2  
  ≥ 41 13.8  
Mode of deliverya    0.008**
 Natural labour 53.2 27.6  
 Assisted natural labour 20.4 17.2  
 Caesarean birth 23.3 48.3  
 Unknown 3.1 6.9  
With congenital conditionsa    1.000
 Yes 99.0 100  
 No 1.0 0  
Type of feedinga    0.749
 Never breastfed 54.2 58.6  
 Exclusively breastfed 3 months or partially breastfed 36.5 37.9  
 Exclusively breastfed for 3 months or more 7.8 3.4  
 Unknown 1.4 0.0  
Highest parental educationa    0.571
  ≤ 9th grade 30.9 20.7  
 10th - 11th grade 44.7 51.7  
  ≥ 12th grade 22.7 27.6  
 Unknown 1.6 0  
Permanent tooth emergence
 mean (SD) 26.2 (2.5) 25.6 (3.7) 0.350
 Completea    
  Yes 232 13 0.753
  No 253 16  
  1. a%, unless otherwise indicated
  2. ***p < 0.001
  3. **p < 0.01