The impact of early life factors on cognitive function in old age: The Hordaland Health Study (HUSK)

BMC Psychology

Table 1 Differences on demographics and outcomes between HUSK-participants with birth journal information (N=346) and participants without (N=1,810)

		Proportion/mean with birth journal information	Proportion/mean without birth journal information	p-value/Mean difference (CI95%)*
Gender (% female)		53.8%	55.3%	p=0.599
Education (% post-compulsory)		60.5%^a	62.9%^b	p=0.429
Self-reported health (% good)		70.5%^c	67.6%^d	p=0.311
Composite score^e		0.08	−0.01	0.09 (−0.02, 0.21)
Separate cognitive tests ^f
	MMS	11.55	11.51	0.04 (−0.05, 0.13)
	Digit Symbol	10.60	10.18	0.42 (−0.06, 0.91)
	KOLT	35.49	35.17	0.32 (−0.61, 1.25)
	COWAT	15.51	15.02	0.49 (−0.15, 1.12)
	TMA	55.23	57.67	−2.44(−6.39, 1.50)
	Block Design	15.01	15.01	0.00 (−0.26, 0.26)

95% confidence intervals in brackets.
*p-values derived from χ² and mean difference derived from independent samples t-tests.
^aAvailable information from N=326.
^bAvailable information from N=1655.
^cAvailable information from N=335.
^dAvailable information from N=1789.
^eComposite score: Z-score of the sum of all cognitive tests (mean: 0, standard deviation: 1).
^fTest-specific raw scores for each cognitive tests (see Methods section for further details).

ISSN: 2050-7283