Table 1.

Effects and interactions of feeding practice and infant age or culture media used for enumeration on bacterial counts in infant feces, as determined by repeated measures two-way ANOVA

Effect or interaction	DF	F value	Pr > Fa	Duncan's groupingb	N	Group	Mean (log10 CFU g-1)
Feeding practice	1	10.11	0.0045	A	215	Breast-fed	9.87
				B	105	Formula-fed	10.71
Infant age	2	0.18	0.8343	A	115	7-day old	10.16
				A	105	14-day old	10.16
				A	100	35-day old	10.12
Feeding practice × infant age	2	1.12	0.3360
Feeding practice	1	10.18	0.0044	A	215	Breast-fed	9.87
				B	105	Formula-fed	10.71
Culture medium	4	11.09	< 0.0001	A	64	CNA	9.25
				A	64	VRBA	9.54
				B	64	BHI	10.34
				BC	64	MRS	10.67
				C	64	WCh	10.93
Feeding practice × culture medium	4	3.32	0.0141

^aProbability value F test: significant when P < 0.05.

^bDuncan's tests: groups within the same effect with the same letter do not differ significantly (P < 0.05).

N = 320