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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