Table 2.

Multiagency data collection record linkage rates and retained sample following cleaning

Data collection		Children			Mothers			Fathers
		Linkage rate		Retained	Linkage rate		Retained	Linkage rate		Retained
	Years	Per cent	N/n	N/n	Per cent	N	N/n	Per cent	N	N/n
Early development
Australian Early Development Census	2009		89 268	87 026
Vital events
NSW Registry of Births, Deaths and Marriages: Birth Registrations data	2000–2006	83.1	74 293	72 245		72 796	72 245		72 778	72 245
NSW Registry of Births, Deaths and Marriages: Death Registrations data	2000–2009*	0.0	2	2	0.2	108	109	0.5	363	369
Australian Bureau of Statistics Mortality data	2000–2007	0.0	0	0	0.1	64	64	0.3	223	223
Health
NSW Ministry of Health Perinatal Data Collection	2000–2006	83.9	74 930	73 056	99.2	72 213	71 663
NSW Ministry of Health Emergency Department Data Collection	2005–2009	61.2	54 598	53 184	44.1	32 068	31 814	43.3	31 529	31 309
NSW Ministry of Health Admitted Patients Data Collection	2000–2009	86.6	77 313	75 391	99.4	72 376	71 824	49.9	36 341	36 170
NSW Ministry of Health Mental Health Ambulatory Data Collection	2000–2009				7.3	5308	4629	4.5	3246	2854
Education
NSW Department of Education Best Start Kindergarten Assessment data (Government schools only)	2009	44.8	40 035	40 032
Child protection
NSW Department of Family and Community Services Case Management System (KiDS) (Child Protection, Out-of-home-care and Brighter Futures)	2003–2009†	4.4	3929	3822
Criminal offending
Bureau of Crime Statistics and Research data	1994–2009				10.1	7350	6180	29.3	21 329	18 540

*NSW Registry of Births, Deaths and Marriages Death Registrations data for the child cohort is for 2009 only.

†Brighter Futures data for the child cohort is available from 2004.

NSW, New South Wales.