Table 2. Age- and sex-adjusted hospital admission rates for skin, bone, and joint infections in children <18 years of age, England, 1997–2006*.

Year	Rate/100,000 child-years (95% CI)
	All skin, bone, and joint infections	Cutaneous abscesses and boils	Cellulitis	Osteomyelitis	Septic arthritis
1997	53.38 (52.07–54.70)	25.19 (24.29–26.10)	19.81 (19.01–20.61)	4.81 (4.42–5.21)	3.57 (3.23–3.91)
1998	57.99 (56.62–59.36)	27.37 (26.43–28.32)	22.24 (21.39–23.09)	4.82 (4.43–5.22)	3.55 (3.21–3.89)
1999	61.34 (59.93–62.75)	28.86 (27.89–29.82)	23.63 (22.75–24.50)	5.24 (4.82–5.65)	3.62 (3.28–3.96)
2000	64.95 (63.49–66.41)	28.94 (27.97–29.91)	26.48 (25.55–27.41)	5.70 (5.27–6.14)	3.83 (3.47–4.18)
2001	61.99 (60.56–63.41)	28.02 (27.06–28.98)	25.25 (24.34–26.16)	5.55 (5.12–5.97)	3.17 (2.85–3.50)
2002	63.65 (62.20–65.09)	29.65 (28.66–30.64)	25.01 (24.11–25.92)	5.45 (5.02–5.87)	3.54 (3.19–3.88)
2003	71.15 (69.62–72.68)	32.71 (31.68–33.75)	29.26 (28.27–30.24)	5.39 (4.97–5.81)	3.79 (3.43–4.14)
2004	73.66 (72.11–75.22)	32.98 (31.94–34.02)	30.63 (29.63–31.64)	6.11 (5.66–6.56)	3.94 (3.58–4.30)
2005	76.26 (74.67–77.84)	35.17 (34.10–36.25)	32.03 (31.00–33.05)	5.63 (5.20–6.07)	3.43 (3.09–3.76)
2006	79.28 (77.66–80.89)	34.43 (33.37–35.49)	33.23 (32.18–34.28)	7.04 (6.55–7.52)	4.58 (4.19–4.97)
p value†	<0.001	<0.001	<0.001	0.004	0.128

*Data from Hospital Episode Statistics. Rates directly adjusted to mid-year 2000 resident population for England. International Classification of Diseases, Tenth Revision, codes for primary diagnosis at admission: cutaneous abscesses and boils, L02; cellulitis, L03; osteomyelitis, M86; septic arthritis (staphylococcal arthritis, M00.0, or pyogenic arthritis, M00.9). All of these codes were included in the category “all skin, bone, and joint infections.” CI, confidence interval.
†p value for test for linear trend across years.