Table 1 Kendall’s rank correlation coefficient between accessory cusp expression and relative intercusp distance.

Sample size for each pairwise comparison in parentheses. Significant values (at P < 0.05) bolded. Blank cells indicate that the feature was invariably absent/present or that samples did not have enough grades of expression for statistical analysis. AUS, Australopithecus; PAR, Paranthropus; HOM, Homo; HSr, recent H. Sapiens; PAN, Pan; GOR, Gorilla; PON, Pongo.

TaxonHYPUMC5CCLMC5LMC6LMC6DLMC7
AUS0.21 (35)−0.31* (24)0.39* (48)0.29 (13)0.26 (19)
PAR0.22* (39)−0.09 (24)0.37* (46)0.38* (38)
HOM−0.24* (94)−0.03 (113)−0.01 (79)0.55* (144)0.36* (127)0.17 (29)0.14 (39)
HSr−0.23* (48)0.07 (49)0.14 (35)0.56* (104)0.39* (67)
PAN−0.02 (49)0.09 (35)0.28* (69)−0.04 (46)
GOR0.51* (16)−0.16 (11)
PON−0.26 (16)0.13 (14)0.33* (29)

*Adherence to PCM predictions (only significant results considered).