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Table 1 Comparison of the characteristics of the participants at birth and school age.

From: Prevalence of non-communicable diseases in Brazilian children: follow-up at school age of two Brazilian birth cohorts of the 1990's

Variables   Ribeirão Preto     São Luís   
  n
Initial sample (excluding 48 deaths)
n
Eligible to follow-up
n
followed up
% followed up p* n
Initial sample (excluding 65 deaths)
n
Eligible to follow-up
n
followed up
% followed up p*
Maternal age (years)      0.005      0.350
   20 to 34 2051 832 563 67.7   1,577 610 442 72.5  
   ≥35 265 114 94 82.5   101 41 32 78.0  
   <20 487 202 131 64.9   698 274 199 72.6  
   Missing 7 2 2 85.7   2 1 0 0.0  
Marital status      < 0.001      0.670
   Married 1,664 666 489 73.5   695 266 199 74.8  
   Cohabiting 690 291 158 54.2   1,107 437 314 71.9  
   Single 338 147 106 72.1   575 223 160 71.7  
   Missing 118 46 37 80.4   1 0 0 0.0  
Maternal schooling (years)      < 0.001      <0.001
   ≥ 12 367 145 93 64.3   119 46 14 30.4  
   9 to 11 607 246 170 69.2   841 324 255 78.7  
   5 to 8 1,028 416 304 73.1   1007 397 301 75.8  
   ≤ 4 618 267 158 59.1   405 157 103 65.6  
   Missing 190 76 65 85.2   6 2 0 0.0  
Parity      0.361      0.049
   1 1148 467 313 67.0   1156 457 316 69.1  
   2 to 4 1474 600 423 70.5   1119 424 321 75.7  
   ≥ 5 160 73 46 63.0   103 45 36 80.0  
   Missing 28 10 8 80.0   0 0 0 0.0  
Sex      0.714      0.001
   Male 1425 581 402 69.2   1295 509 348 68.4  
   Female 1384 569 388 68.2   1083 417 325 77.9  
   Missing 1 0 0 0.0   0 0 0 0.0  
Total 2810 1150 790 68.7   2378 926 673 72.7  
  1. Ribeirão Preto, 1994 and 2004/05 and São Luís, 1997/98 and 2005/06
  2. * P value calculated by the chi-squared test.