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Table 1 Demographic distribution of migrant children in the baseline survey in 2011

From: Oral health knowledge, behaviors and parental practices among rural–urban migrant children in Guangzhou: a follow-up study

  Total Boys Girls p-value a
n (%)b n (%)b n (%)b
Sample size 1042 (100) 594 (57.01) 448 (42.99)  
Age (year), mean ± sd 9.56 ± 1.00 9.67 ± 1.02 9.41 ± 0.94 <0.001
Grade     0.067
 3 501 (48.08) 271 (45.62) 230 (51.34)  
 4 541 (51.92) 323 (54.38) 218 (48.66)  
Siblings     0.398
 0 98 (9.40) 62 (10.44) 36 (8.03)  
 1-2 590 (56.62) 330 (55.55) 260 (58.04)  
 3 or more 354 (33.98) 202 (34.01) 152 (33.93)  
Place of birth     0.037
 Guangdong Province 559 (53.65) 302 (50.84) 257 (57.37)  
 Other Province 483 (46.35) 292 (49.16) 191 (42.63)  
Age at moving to Guangzhou     0.055
 0 ~ 3 413 (39.64) 228 (38.38) 185 (41.29)  
 3 ~ 6 338 (32.44) 183 (30.81) 155 (34.60)  
 6 and above 291 (27.92) 183 (30.81) 108 (24.11)  
Family economic status     0.007
 Good 361 (34.64) 182 (30.64) 179 (39.96)  
 Median 555 (53.26) 335 (56.40) 220 (49.11)  
 Poor 126 (12.10) 77 (12.96) 49 (10.93)  
  1. aStatistical evaluation using chi-square tests for differences according to gender
  2. bAll data are expressed as n (%) unless otherwise stated