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Table 1 Characteristics and person years of follow-up time (2000–2013) for Aboriginal and non-Aboriginal children in a population cohort born between July 2000 and December 2012 in New South Wales, Australia

From: Inequalities in pediatric avoidable hospitalizations between Aboriginal and non-Aboriginal children in Australia: a population data linkage study

  Non-Aboriginal Aboriginal
N % Person years N % Person years
Total 1,085,831 100 7,681,406 35,609 100 223,190
Birth year
 Jul 2000–Dec 2004 367,542 34 4,125,434 9,047 25 100,296
 Jan 2005–Dec 2008 353,945 33 2,466,933 11,607 33 79,332
 Jan 2009–Dec 2012 364,344 34 1,089,040 14,955 42 43,562
Contribution of follow-up to age groupa
 Less than 2 years - - 2,123,515 - - 68,971
 2–4 years - - 1,802,906 - - 55,189
 4–6 years - - 1,440,318 - - 41,123
 6–8 years - - 1,081,702 - - 28,451
 8–10 years - - 736,009 - - 18,066
 10–12 years - - 406,279 - - 9,431
 12–13 years - - 90,678 - - 1,959
Sex
 Female 527,500 49 3,729,845 17,251 48 108,591
 Male 558,331 51 3,951,561 18,358 52 114,599
Low birth weight and/or premature birth
 No 1,017,508 94 7,212,029 32,039 90 201,599
 Yes 68,323 6 469,377 3,570 10 21,591
Private patient and/or health insurance
 No 702,362 65 5,049,008 34,531 97 217,477
 Yes 383,469 35 2,632,399 1,078 3 5,713
Geographical remoteness
 Major city 730,967 67 5,105,713 10,238 29 64,754
 Inner regional 262,887 24 1,899,768 13,231 37 79,583
 Outer regional 84,425 8 617,719 8,837 25 56,053
 Remote/Very remote 7,552 1 58,205 3,303 9 22,800
Area-level socio-economic disadvantageb
 First quintile (Most disadvantaged) 199,716 18 1,443,310 16,719 47 107,615
 Second quintile 235,069 22 1,669,550 9,746 27 59,739
 Third quintile 219,196 20 1,560,849 6,210 17 37,857
 Fourth quintile 225,527 21 1,569,176 2,344 7 14,415
 Fifth quintile (Least disadvantaged) 206,323 19 1,438,522 590 2 3,564
  1. aChildren contribute person years of follow-up from the date they are 29 days old until their death or the end of the study period (December 31, 2013). Many of the children contribute person years of follow-up to more than one age group during the study period; bSocio-economic indices for Areas (SEIFA) Index of Relative Socio-Economic Advantage and Disadvantage based on the child’s statistical local area of residence at birth