Table 1.

Sociodemographic characteristics, consumption of dairy products, physical activity (PA) and bone mineral density (BMD) in children belonging to the 2004 Pelotas (Brazil) Birth Cohort

	Boys		Girls
	n or Mean	% or sd	n or Mean	% or sd
Maternal schooling (years)
0–4 years	264	15·0	253	15·4
5–8 years	734	41·6	701	42·6
9–11 years	585	33·1	553	33·6
≥12 years	182	10·3	140	8·5
Skin colour
White	1176	67·3	1118	67·7
Black	233	13·3	192	11·6
Brown	256	14·7	240	14·5
Other	82	4·7	102	6·2
Daily frequency of consumption of cow’s milk at 4 years
<1	311	18·0	295	18·2
1–2	680	39·1	681	42·1
3	547	31·6	484	29·9
≥4	195	11·3	157	9·7
Daily frequency of consumption of yoghurt at 4 years
<1	1112	64·1	1086	67·1
1	417	24·1	362	22·4
≥2	204	11·8	169	10·5
Daily frequency of consumption of cow’s milk at 6 years
<1	424	26·0	443	28·7
1–2	715	43·7	777	50·2
3	447	27·4	293	18·9
≥4	48	2·9	34	2·2
Daily frequency of consumption of yoghurt and cheese at 6 years
<1	742	45·5	725	47·0
1	447	27·5	445	28·9
≥2	439	27·0	372	24·1
Maternal perception of PA at 4 years
Below average	94	5·4	68	4·2
Average	800	46·2	716	44·3
Above average	837	48·4	832	51·5
Maternal perception of PA at 6 years
Below average	188	10·8	168	10·2
Average	845	48·4	808	49·1
Above average	712	40·8	671	40·7
Overall PA by accelerometer at 6 years (m g )	64·0	17·4	54·8	13·5
MVPA by accelerometer at 6 years (min)	55·6	38·4	33·4	186·3
Total-body BMD (g/cm2)	0·834	0·048	0·819	0·049
Lumbar-spine (L1–L4) BMD (g/cm2)	0·646	0·079	0·667	0·088

MVPA, moderate-to-vigorous PA.