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Table 1 Distribution of the sample and the population in the 10 regions of Ningbo

From: The association between low birth weight and dental caries among 11-to-13-year-old school age children in Ningbo, China

  Numbers of sample Number of Population by Region
  (n) % (n) %
Beilun 609 7.0 429,700 7.1
Cixi 1638 18,8 1059,600 17.4
Fenghua 673 7.7 480,600 7.9
Haishu 951 10.9 633,500 10.4
Jiangbei 378 4.3 262,800 4.3
Ninghai 877 10.1 633,900 10.4
Xiangshan 747 8.6 560,400 9.2
Yingzhou 1376 15.8 931,000 15.3
Yuyao 1071 12.3 835,900 13.7
Zhenhai 382 4.4 257,600 4.3