Table 1.

Associated co-morbidities in the patients who did not develop anemia compared with those who did develop anemia in the post-operative period

Co-morbidity	% of patients without anemia	% of patients with anemia	P
Hypertension	81.1	79.5	0.72
Diabetes mellitus	24.2	21.0	0.71
Asthma	29.5	19.8	0.89
Smoking	49.0	44.1	0.86
Menstruation	67.7	84.2	0.02
Peptic ulcer disease	6.0	22.0	0.01
Coronary artery disease	7.9	14.2	0.75
Thyroid disease	13.2	5.6	0.19