Table 3 Percentage (95% CIs) of records classified as missed matches compared with reference standard following deterministic and probabilistic data linkage
Records from 1998 to 2003 (n = 99,220)Records from 2004 to 2009 (n = 128,666)Records from 2010 to 2015 (n = 189,373)
DeterministicProbabilisticDeterministicProbabilisticDeterministicProbabilistic
Links58,76862,941100,282101,086153,226153,547
Specificity %0.9850.9810.9870.9960.9980.997
Sensitivity %0.9140.9760.9930.9940.9970.999
Missed match %8.6 (8.4, 8.8)2.4 (2.2, 2.5)1.3 (1.2, 1.3)0.4 (0.4, 0.5)0.4 (0.3, 0.4)0.1 (0.1, 0.1)
Age
0–312.1 (11.8, 12.5)3.2 (3.1, 3.4)1.4 (1.3, 1.4)0.4 (0.3, 0.4)0.2 (0.2, 0.3)0.0 (0.0, 0.1)
4–73.8 (3.4, 4.1)1.3 (1.1, 1.5)1.7 (1.5, 2.0)0.8 (0.6, 1.0)0.4 (0.3, 0.5)0.2 (0.1, 0.2)
8–112.2 (1.9, 2.4)0.6 (0.4, 0.7)1.7 (1.5, 2.0)0.7 (0.5, 0.9)0.3 (0.2, 0.4)0.1 (0.0, 0.1)
12–150.7 (0.5, 0.8)0.2 (0.1, 0.3)0.8 (0.7, 1.0)0.5 (0.4, 0.6)
16–190.6 (0.5, 0.7)0.1 (0.0, 0.2)0.6 (0.5, 0.7)0.3 (0.2, 0.3)
20–230.2 (0.2, 0.3)0.1 (0.0, 0.1)
Sex
Missing100.0 (all missed)21.0 (14.6, 26.5)100.0 (all missed)40.0 (9.6, 58.3)100.0 (all missed)16.7 (1.8, 21.9)
Male8.6 (8.3, 9.0)2.4 (2.3, 2.6)1.3 (1.2, 1.4)0.4 (0.3, 0.5)0.3 (0.3, 0.3)0.1 (0.1, 0.1)
Female8.2 (7.9, 8.5)2.2 (2.1, 2.4)1.3 (1.2, 1.4)0.4 (0.4, 0.5)0.4 (0.3, 0.4)0.1 (0.1, 0.2)
Ethnic group
Missing10.4 (10.1, 10.8)2.7 (2.6, 2.9)2.2 (2.0, 2.4)0.6 (0.5, 0.7)0.9 (0.7, 1.0)0.2 (0.1, 0.3)
White6.8 (6.5, 7.1)2.0 (1.8, 2.1)1.0 (0.9, 1.0)0.4 (0.3, 0.4)0.3 (0.2, 0.3)0.1 (0.1, 0.1)
Mixed3.7 (0.1, 4.4)0.9 (−0.9, 1.8)1.0 (0.6, 1.3)0.3 (0.1, 0.4)0.2 (0.1, 0.3)0.2 (0.1, 0.3)
Asian7.0 (6.0, 8.0)2.2 (1.6, 2.6)1.0 (0.8, 1.2)0.3 (0.2, 0.4)0.6 (0.4, 0.7)0.2 (0.1, 0.2)
Black7.0 (5.5, 8.3)2.3 (1.4, 2.9)1.4 (1.0, 1.7)0.4 (0.2, 0.6)0.4 (0.2, 0.5)0.1 (0.0, 0.2)
Chinese/Other11.7 (10.1, 13.2)2.7 (1.8, 3.3)4.4 (3.5, 5.3)0.6 (0.3, 0.9)0.9 (0.6, 1.1)0.1 (0.0, 0.2)
Socio-economic group
Missing26.4 (25.2, 27.6)4.3 (3.8, 4.9)1.7 (1.5, 1.8)0.5 (0.4, 0.6)0.2 (0.1, 0.2)0.1 (0.0, 0.1)
Low deprivation7.1 (6.8, 7.3)2.2 (2.1, 2.4)1.0 (0.9, 1.1)0.4 (0.3, 0.4)0.3 (0.2, 0.3)0.1 (0.1, 0.1)
High deprivation6.8 (6.4, 7.1)2.2 (2.0, 2.4)1.1 (1.0, 1.3)0.5 (0.4, 0.5)0.3 (0.2, 0.3)0.2 (0.1, 0.2)
Foreign69.4 (61.2, 78.1)66.3 (59.8, 73.1)1.5 (−0.2, 3.2)31.6 (27.7, 35.4)0.8 (0.0, 0.9)
No fixed abode8.7 (2.0, 12.0)0.0 (none missed)

Note. Number of records in each category shown in Table 6