Table 2 Descriptive statistics and Kruskal– Wallis test values of pore frequency, pore shape and pore position in different age groups of the population

A (Below 30)

206.22 (232.86-172.41)

177.00 (214.00-128.00)

1652.50 (1921.00- 421.75)

647.00 (779.25-516.50)

1190.00 (1373.00- 1012.25)

B (31-39)

185.88 (231.83-155.08)

133.50 (185.75-86.00)

1504.00 (1886.50-1266.00)

600.50 (702.00-458.00)

1035.50 (1442.25- 867.25)

C (40-49)

220.33 (253.33-185.00)

187.00 (242.50-133.50)

1736.00 (2091.00-530.00)

690.00 (840.00-539.50)

1230.00 (1467.50-1097.00)

D (Above 49)

204.00 (241.72-182.83)

157.00 (214.50-116.00)

1680.00 (1990.00-1518.00)

591.00 (838.50-507.50)

1232.00(1431.50-1112.00)

P-value

0.255

0.152

0.273

0.384

0.191