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

BMC Psychology

Table 2 Sample characteristics at birth obtained from medical records, and at age 72–74 years obtained from HUSK

		N	Mean (SD*)	Proportion (%)
From medical records
Birth weight (kg)		346	3.47 (0.53)	-
Birth length (cm)		346	50.27 (2.11)	-
Head circumference (cm)		344	34.42 (1.70)	-
Ponderal index (weight/height³)		346	2.64 (0.24)	-
Mother’s pelvic size (cm)^a		324	26.10 (1.33)	-
Mother’s age		346	29.40 (5.85)	-
Parity (number of births)		346	2.61 (1.95)	-
Gender (% female)		346	-	53.8%
Mother’s condition after birth (% good)		346	-	90.2%
Tuberculosis in family (% no)		346	-	88.7%
CVD in family (% no)		346	-	87.0%
Mother’s appearance (% good)		346	-	76.3%
Complications birth (% no)^b		346	-	89.6%
Socioeconomic status (% lower)		346	-	55.8%
Unmarried (% no)		346	-	96.2%
Teeth lower jaw (% good)		335	-	42.1%
Type of payment (% no insurance)		245	-	44.1%
Number of diseases (%≤1)		346	-	69.4%
From HUSK at age 72–74 years
Composite score^c		346	0.08 (0.95)	-
Separate cognitive test ^d
	MMS	346	11.55 (0.85)	-
	Digit Symbol	346	10.60 (4.37)	-
	KOLT	346	35.49 (7.86)	-
	COWAT	346	15.51 (5.40)	-
	TMA	346	55.23 (29.06)	-
	Block Design	346	15.01 (2.08)	-

*Standard deviation.
^aMean of the interspinous distance, the intercristal distance and the external conjugate in centimeters.
^bIncluding, but not limited to, prolonged labour, abnormal presentation assisted delivery of the baby (use of forceps) and episiotomy, uterine rupture, discoloured amniotic fluid, abnormal fetal souffle and placenta praevia, and combinations of these.
^cComposite score: Z-score of the sum of all cognitive tests (mean: 0, standard deviation: 1).
^dTest-specific raw scores for each cognitive tests (see methods section for further details).

ISSN: 2050-7283