Table 2 Number, person years and adjusted rates of coding before and after the simple coding intervention. Rates given are per 1000 person years at risk per calendar year. CI = confidence interval

	Denominator		Child with ≥1 maltreatmentrelated codes per calendar year		Child with a code reflecting a child protection procedure per calendar year		Child flagged ‘cause for concern’ per calendar year
	Children (N)	Person years at risk	Children (n)	Adjusted rate (95% CI)	Children (n)	Adjusted rate (95% CI)	Children (n)	Adjusted rate (95% CI)
Before intervention: 2010–2011
Overall	20,975	36,140	309	9.1 (8.0–10.2)	78	2.3 (1.8–3.0)	68	2.1 (1.6–2.8)
<5 years	5697	9316	122	14.0 (11.4–17.2)	29	3.6 (2.3–5.5)	39	4.6 (3.2–6.6)
5–18 years	15,278	26,824	187	7.0 (6.0–8.0)	49	1.8 (1.3–2.4)	29	1.1 (0.7–1.6)
After intervention: 2012
Overall	21,783	19,560	226	12.3 (10.7–14.2)	66	3.7 (2.8–4.8)	91	5.3 (4.2–6.7)
<5 years	6468	5286	81	17.4 (13.5–22.3)	21	4.9 (2.9–8.0)	36	8.7 (5.8–12.5)
5–18 years	15,315	14,273	145	10.2 (8.6–12.0)	45	3.2 (2.3–4.2)	55	3.9 (2.9–5.0)