  The glitch size, $ \Delta\nu/\nu $, inter-glitch time interval, $ t_{i} $ and
frequency of glitches in pulsars are key parameters in discussing glitch
phenomena. In this paper, the glitch sizes and inter-glitch time intervals were
statistically analysed in a sample of 168 pulsars with a total of 483 glitches.
The glitches were broadly divided into two groups. Those with $ \Delta\nu/\nu <
10^{-7} $ are regarded as small size glitches, while those with $ \Delta\nu/\nu
\geq 10^{-7} $ are regarded as relatively large size glitches. In the ensemble
of glitches, the distribution of $ \Delta\nu/\nu $ is seen to be bimodal as
usual. The distribution of inter-glitch time intervals is unimodal and the
inter-glitch time intervals between small and large size glitches are not
significantly different from each other. This observation shows that
inter-glitch time intervals are size independent. In addition, the distribution
of the ratio $ \Delta\nu/\nu:t_{i} $ in both small and large size glitches has
the same pattern. This observation suggests that a parameter which depends on
time, which could be the spin-down rate of a pulsar plays a similar role in the
processes that regulate both small and large size glitches. Equally this could
be an indication that a single physical mechanism, which could produce varying
glitch sizes at similar time-intervals could be responsible for both classes of
glitch sizes.
