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Table 2 Number of years in which cases and comparators have records in socio-demographic, health service and pharmaceutical tables between 2008 and 2015, TDI-IMA database, Belgium

From: Longitudinal pharmacoepidemiological and health services research for substance users in treatment: protocol of the Belgian TDI-IMA linkage

Number of years with linkage IMA socio-demographic tables IMA health service tables IMA pharmaceutical tables
cases comparators cases comparators cases comparators
N % N % N % N % N % N %
0 0 0% 0 0% 34 0.1% 1626 1.3% 289 0.9% 4026 3.3%
1 35 0.1% 426 0.4% 73 0.2% 1578 1.3% 652 2.1% 5433 4.5%
2 75 0.2% 879 0.7% 191 0.6% 2083 1.7% 1090 3.5% 7481 6.1%
3 128 0.4% 1355 1.1% 362 1.2% 2838 2.3% 1556 5.0% 9455 7.7%
4 239 0.8% 1735 1.4% 676 2.2% 3935 3.2% 2067 6.7% 11,178 9.2%
5 282 0.9% 1746 1.4% 1226 4.0% 5780 4.7% 2908 9.4% 12,767 10.5%
6 412 1.3% 1922 1.6% 2125 6.9% 8936 7.3% 3552 11.5% 14,594 12.0%
7 501 1.6% 886 0.7% 3995 12.9% 16,870 13.8% 4739 15.3% 17,203 14.1%
8 29,233 94.6% 113,193 92.7% 22,223 71.9% 78,496 64.3% 14,052 45.5% 40,005 32.8%
total 30,905 100% 122,142 100% 30,905 100% 122,142 100% 30,905 100% 122,142 100%