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Table 5 Combinations of 2 or more codes and keywords and with RA keyword and DMARD prescription

From: Optimising the use of electronic health records to estimate the incidence of rheumatoid arthritis in primary care: what information is hidden in free text?

Combination N (6387) %
1 or more codes 5655 88.5
2 or more codes 3894 61.0
3 or more codes 1873 29.3
1 or more codes or keyword 5834 91.3
2 or more codes or keyword 4810 75.3
3 or more codes or keyword 3533 55.3
1 or more codes and 1 or more keyword 3404 53.3
1 or more codes and 2 or more keywords 2057 32.2
2 or more codes and 1 or more keyword 2602 40.7
Combinations with RA keyword   
RA keyword and 1 or more codes 1742 27.3
RA keyword and 2 or more codes 1406 22.0
RA keyword and 3 or more codes 790 12.4
RA keyword and 1 or more other keywords 1739 27.2
RA keyword and 2 or more other keywords 838 13.1
RA keyword and 3 other keywords 236 3.7
RA keyword and 1 or more codes or keywords 1845 28.9
RA keyword and 2 or more codes or keywords 1734 27.1
RA keyword and 3 or more codes or keywords 1470 23.0
Combinations with DMARD prescription   
DMARD and 1 or more codes 1598 25.0
DMARD and 2 or more codes 1022 16.0
DMARD and 3 or more codes 474 7.4
DMARD and 1 or more keyword 1128 17.7
DMARD and 2 or more keywords 749 11.7
DMARD and 3 keywords 371 5.8
DMARD and 1 or more codes or keywords 1712 26.8
DMARD and 2 or more codes or keywords 1339 21.0
DMARD and 3 or more codes or keywords 1000 15.7