Table 3

 Comparison of patients who were offered gastrointestinal investigation with those who were not

No (%) of patients offered investigationNo (%) of patients not offered investigationAdjusted odds ratio*95% CIp Value
*Random effects logistic regression, adjusted for patients within practices. NSAID, non-steroidal anti-inflammatory drug.
Factor(n = 217)(n = 140)
    Female sex123 (57)100 (71)0.490.30 to 0.800.004
    Aged <6541 (19)47 (34)0.440.26 to 0.740.002
    Haemoglobin ⩾90 g/l97 (45)92 (66)0.380.23 to 0.61<0.001
    History of gastrointestinal complaints102 (47)78 (56)0.680.43 to 1.080.10
    History of anaemia46 (21)56 (40)0.390.24 to 0.64<0.001
    Use of aspirin or NSAID in previous 3 months74 (34)41 (29)1.330.82 to 2.170.25
(n = 186)(n = 108)
    Clinical symptoms of anaemia noted112 (52)61 (44)1.170.70 to 1.950.55
    Gastrointestinal symptoms noted61 (28)14 (10)3.511.78 to 6.94<0.001
Multivariate analysis
    Female sex0.400.23 to 0.690.001
    Age <65 years0.480.27 to 0.850.01
    Haemoglobin ⩾90 g/l0.370.22 to 0.62<0.001
    Previous anaemia0.430.25 to 0.730.002