. Author manuscript; available in PMC: 2014 Jun 1.

Published in final edited form as: Ann N Y Acad Sci. 2013 May 3;1288(1):17–35. doi: 10.1111/nyas.12109

Table 5.

Summary of Handedness Data for Tool Use from Wild Chimpanzees

	#L	#R	#A	Mean HI	t-value
Termite Fishing ¹²⁴	46	24	7	−.237	−2.77 ^*
Ant Dipping ⁹⁸	7	22	10	.292	2.21 ^*
Wadge Dip/Leaf Sponge ^{99, 125}	9	27	4	.336	3.10 ^*
Nut Cracking ^{99, 126}	32	44	13	.117	1.51
Pestle Pounding¹²⁷
Pound Action	7	10	2	.012	0.78
Reach Action	4	15	1	.341	2.34 ^*
Algae Dip ¹²⁷	5	9	0	.037	0.21
Throwing⁹⁶	1	3	12	.089	1.65⁺

indicates significant population-level handedness at p < .05.

⁺

indicates population-level bias at p < .10. Analyses were based on one-sample t-tests on the HI scores.