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
| 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 |
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