Table 1

Prevalence of bruising according to age and development when stated

Studies defining prevalence according to age
	Infants	Preschool	School age
Carpenter	6–12 months = 12.4% (n = 177)
	Mean number of bruises per child 1.45, range 1–4

Mortimer	0–12 month = 1% (n = 620)
	Mean number of bruises per child = 2, range 1–6

Tush		36–48 months = 90% (n = 30)
		mean no. bruises per child = 5.6
		range 1–27

Sugar	0–6 months = 0.5% (n = 366)	12–24 months = 42% (n = 223)
	6–12 months = 10.6% (n = 226)	24–35 months = 61% (n = 115)

Labbe	0–8 months = 1.2%	9 months–4 years = 60.3% (n = 1012)	5–9 years = 80.3%
	n = 246		n = 579
			10–17years = 52.7%
			n = 203

Studies defining prevalence according to developmental stage
	Pre-crawling	Crawling	Cruising	Walking
Carpenter	3.9% (4/101)	17.3% (9/52)	Not defined in study	37.5% (9/24)

Sugar	Pre-cruisers 2.2% (11/511)		17.8% (18/101)	51.9% (165/318)
	Mean no bruises per child 1.3			Mean no. bruises 5.6
	Range 1–2		Range 1–5	Range 1–27