Variation of 3D outer and inner crown morphology in modern human mandibular premolars.

The correlation between P 3 s and P 4 s lnCS was strong ( r = 0.875) and highly significant ( p < .001; see Figure 4 ).

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We also found a nonsignificant trend for size differences at the population level, but our data sample might have been too small to reach significance.

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