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. 2015 May 13;10(5):e0124980. doi: 10.1371/journal.pone.0124980

Table 2. Measurements from the Age Reference Point to the mesial end of the dental alveolus made on African elephants in Zimbabwean populations.

Molars* Age (y) Male Mean ± SD n Female Mean ± SD n Between sex p-value
M1 0–0.9 13.3 ± 0.25 2 12.9 ± 0.15 3 0.130
M2 1–1.8 14.3 ± 1.00 7 13.3 ± 0.58 6 0.053
M3 2–6.5 19.8 ± 1.80 18 18.5 ± 2.39 11 0.118
M4# 7–15 22.2 ± 0.25 4 22.3 ± 3.08 30 0.920
M5 16–28.5 28.2 ± 1.74 17 26.5 ± 1.24 40 <0.001
M6 29–70+ 31.5 ± 1.26 70 28.1 ± 1.23 47 <0.001

With the exception of between M1 and M2 group, significant differences (<0.001) were found between all molar male groups, all molar female groups and molar groups including totals of both male and female.

*For example, from M1L1 to M1L5 for Molar 1. For molar 2, M2L1 to M2L7. And so on for the other molars.

# All 4 males were 7–8 years of age while the females range from 7–15 years.