(I) Age group (J) Age group Number of
sebaceous glands/field
Average area of
collagen fibres
Optic density of
elastic fibres
Mean Difference
(I-J)
P
value
Mean Difference
(I-J)
P value Mean Difference
(I-J)
P value
Early weaning Late weaning  5.40 0.000* -0.34 1 -0.10 1
Pre-pubertal 4.20 0.001* -10.26 .054 15.48 0.000*
Adolescent 4.40 0.001* -16.00 0.001* 20.54 0.000*
Adulthood 5.20 0.000* -12.48 0.01* 20.97 0.000*
2nd year 5.40 0.000* -2.09 1 20.86 0.000*
Late
weaning 
Early weaning -5.40 0.000* 0.34 1 0.10 1
Pre-pubertal -1.20 1 -9.92 0.07 15.58 0.000*
Adolescent -1.00 1 -15.66 0.001* 20.64 0.000*
Adulthood -0.20 1 -12.14 0.01* 21.07 0.000*
Aged-phase 0.00 1 -1.752 1 20.96 0.000*
Pre-pubertal Early weaning -4.20 0.001* 10.26 0.054 -15.48 0.000*
Late weaning  1.00 1 9.92 0.07 -15.58 0.000*
Adolescent 0.20 1 -5.74 1 5.06 0.000*
Adulthood 1.00 1 -2.22 1 5.49 0.000*
Aged-phase 1.20 1 8.17 0.2 5.38 0.000*
Adolescent Early weaning -4.40 0.001* 16.00 0.001* -20.54 0.000*
Late weaning  1.00 1 15.66 0.001* -20.64 0.000*
Pre-pubertal -0.20 1 5.74 1 -5.06 0.000*
Adulthood 0.80 1 3.52 1 0.43 1
Aged-phase 1.00 1 13.91 0.003* 0.32 1
Early weaning -5.20 0.000* 12.48 0.01* -20.97 0.000*
Adulthood Late weaning  0.20 1 12.14 0.01* -21.07 0.000*
Pre-pubertal -1.00 1 2.22 1 -5.49 0.000*
Adolescent -0.80 1 -3.52 1 -0.43 1
  Aged-phase 0.20 1 10.39 0.04* - 0.11 1
Early weaning -5.40 0.000* 2.09 1 -20.86 0.000*
Aged-phase Late weaning  0.00 1 1.752 1 -20.96 0.000*
Pre-pubertal -1.20 1 -8.17 0.2 -5.38 0.000*
Adolescent -1.00 1 -13.91 0.003* -0.32 1
Adulthood -0.20 1 -10.39 0.04* 0.11 1
Table 5: Comparison between the means of the number of sebaceous glands, average area of collagen fibres and optic density of elastic fibres of the different studied groups.