Table 5

WPPSI-R score at 5 years of age and duration of breast feeding (BF)

		Duration of BF				ANOVA
		<3 months	3–6 months			⩾6 months	Total p	p for trend
Number BF	49	61	183		293^5-150
Total IQ	103.6 (14.6)	107.9 (17.2)	111.0 (14.3)^5-151		109.1 (15.2)	0.007	0.002
Verbal IQ	100.4 (13.9)	103.9 (15.4)	106.1 (14.4)		104.7 (14.6)	0.047	0.014
Performance IQ	106.1 (15.1)	109.4 (16.8)	113.4 (14.1)^5-151		111.3 (15.1)	0.005	0.001

Results expressed as mean (SD).
↵5-150 Two children did not complete the WPPSI-R-test.
↵5-151 Significantly different from <3 months (p < 0.001, Sheffé's test).
MDI, Mental Developmental Index; PDI, Psychomotor Developmental Index.