Results of the present study are in contradiction to that
reported by Anandhalakshmi et al. (2013) who reported that, none of the pulmonary functions are significantly different
between the two groups (cases with duration shorter and those
longer than 10 years) [16]. However, Barret-Connor et al.
(1996), found that FEV1 and FVC were low in diabetic cases,
who had diabetes for more than 10 years and in hyperglycemic,
which became more apparent with the increase in the duration
of diabetes. Our study shows that the duration of diabetes had
influenced lung functions [24].