Table 2. Observed and expected frequencies for age group at registration and current age group compared to the U.K. general population (analysed using dataset 1 –March 2017).

Variable	Age Group	Observed N	Expected N
Registration Age	0–4	348632	1424220.1
	5–9	163894	1447567.9
	10–14	244110	1284132.9
	15–19	4416524	1354176.5
	20–24	2460251	1517611.6
	25–29	2855796	1611003.0
	30–34	2373948	1564307.3
	35–39	2007287	1494263.7
	40–44	1755326	1494263.7
	45–49	1584631	1634350.9
	50–54	1342209	1657698.8
	55–59	1073767	1447567.9
	60–64	832983	1260785.0
	65–69	978176	1284132.9
	70–74	531163	1003958.4
	75–79	237967	770479.7
	80–84	78709	560348.9
	85–89	24250	350218.1
	90+	61595	210130.8
Current Age	0–4	82088	1424220.1
	5–9	110062	1447567.9
	10–14	108830	1284132.9
	15–19	593158	1354176.5
	20–24	1470847	1517611.6
	25–29	2031314	1611003.0
	30–34	2256780	1564307.3
	35–39	2472607	1494263.7
	40–44	2317232	1494263.7
	45–49	2419899	1634350.9
	50–54	2157589	1657698.8
	55–59	1732592	1447567.9
	60–64	1393202	1260785.0
	65–69	1255913	1284132.9
	70–74	1164751	1003958.4
	75–79	758709	770479.7
	80–84	523867	560348.9
	85–89	311394	350218.1
	90+	210384	210130.8