Table 3-2: Percent Distribution
 % of Grade I % of Grade II % of Grade III
Diabetic 2/8 = 25% 2/8 = 25% 4/8 = 50%
Non-diabetic 6/14 = 42.9% 3/14 = 21.4 % 5/14 = 28.5%


Chi square for linear trend: 0.6516


p value: 0.4196


Grading Distribution


60.0

50.0

40.0

30.0

20.0

10.0

0.0


50.0


42.9


25.0


* Diabetic
* Non-Diabetic


Grade I Grade II Grade III


Figure 3-3: Grading Distribution

 The universe of a study is the total collection of objects that are of interest in the

project. For this investigation the universe is the collection of gingival tissue samples or

more practically gingival tissue in adults. Each gingival tissue sample is the experimental

unit. A convenience sample was used as the experimental units were chosen from those

available in the local setting and agreed to participate. The response variable is the

observation or outcome measurement that records the state of the physical phenomenon

being studied. The response variable for this study is the observation of IGF-1 receptors

(ranked grade I through III subjectively).