Table 1

Number and percentage of 2570 collections with at least one bruise, mean number (and range) of bruises and sites affected, with SDs, by developmental stage

Number and percentage
with 95% CI of collections
with at least one bruise		Mean (SD) number
of bruises per collection		Mean (SD) number
of sites affected
per collection		Range, median and
90th centile of number
of bruises per collection
Premobile
Age range 0–11 months		68/1010
6.7%
(95% CI 5.3 to 8.4)		0.09 (0.35)0.08 (0.30)0–3
0
0
Early mobile
Age range 4–18 months		218/478
45.6%
(95% CI 41.2 to 50.1)		0.80 (1.19)0.59 (0.79)0–7
0
2
Walking
Age range 10–70 months		852/1082
78.8%
(95% CI 76.2 to 81.1)		2.82 (2.77)1.50 (1.23)0–16
10–36 months422/594
71.0%
(95% CI 67.3 to 74.5)		2.31 (2.59)1.28 (1.17)0–14
2
6
37–70 months387/430
90.0%
(95% CI 86.8 to 92.4)		0–16
3
7
Overall
Age range 0–70 months		1138/2570
44.8%
(95% CI 42.4 to 46.2)		1.37 (2.27)0.77 (1.10)0–16
0
4