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Table 2 NHI and matched cohort populations by age group, 2006

From: Novel use of three administrative datasets to establish a cohort for environmental health research

 

NZ resident population* 7 March 2006

Match rate

NHI overcount rate ratio

 

NHI

Cohort

Cohort NHI

Poisson regression all variables, 95% CI

Total

4,076,824

3,838,119

0.70

  

Sex

Male

1,939,949

1,335,200

0.69

Reference

Female

2,136,875

1,506,668

0.71

0.01

(0.01-0.02)

Age group

0-4 yrs

286,271

211,013

0.74

Reference

5-14 yrs

634,837

458,886

0.72

−0.01

(−0.01-0.00)

15-24 yrs

559,405

395,137

0.71

−0.03

(−0.03--0.02)

25-34 yrs

578,160

399,507

0.69

−0.04

(−0.05--0.04)

35-44 yrs

642,419

446,121

0.69

−0.03

(−0.04--0.03)

45-54 yrs

527,984

364,903

0.69

−0.03

(−0.04--0.03)

55-64 yrs

387,451

267,238

0.69

−0.03

(−0.04--0.03)

65-74 yrs

249,283

171,477

0.69

−0.04

(−0.04--0.03)

75-84 yrs

168,719

106,199

0.63

−0.10

(−0.11--0.09)

85-89 yrs

42,295

21,387

0.51

−0.24

(−0.26--0.23)

Ethnic group

Non-MPA

2,999,269

2,069,696

0.69

Reference

NZ Māori

533,291

377,854

0.71

0.01

(0.01-0.02)

Pacific Peoples

287,148

220,139

0.77

0.03

(0.02-0.03)

Asian Peoples

280,431

191,490

0.68

−0.04

(−0.05--0.04)

NZDep2006 quintile

1-2

618,705

441,187

0.71

Reference

3-4

687,517

455,011

0.66

−0.02

(−0.03--0.02)

5-6

783,175

540,159

0.69

−0.02

(−0.03--0.02)

7-8

946,406

678,209

0.72

−0.02

(−0.02--0.02)

9-10

1,041,021

727,302

0.70

−0.05

(−0.05--0.04)

Rural classification

Main urban

2,988,399

2,203,487

0.74

Reference

Secondary urban

286,447

193,980

0.68

−0.05

(−0.05--0.04)

Minor urban

376,479

263,203

0.70

−0.03

(−0.03--0.02)

Rural centre

104,015

52,498

0.50

−0.24

(−0.24--0.23)

Other rural

320,973

128,568

0.40

−0.40

(−0.41—0.40)

  1. *New Zealand residents with New Zealand addresses, aged <90 years, with ethnicity and NZDep quintile known.