Table 1.

Monkey performance in behavioural tests. A trial is defined as the act of a monkey putting an apple slice into its mouth followed by acceptance or rejection of the slice.

object (code)	sex	age	PTC-treated			control			total	p-valuea
			acceptance	trial	%	acceptance	trial	%
P. femoralis (F)	female	adult	28	28	100	54	54	100	82	0.2871
T. auratus 1 (A1)	female	adult	17	22	77.27	38	39	97.43	61	0.003751
T. auratus 2 (A2)	female	adult	2	4	50	6	6	100	10	0.01092
T. auratus 3 (A3)	male	adult	21	21	100	36	36	100	57	0.5243
T. auratus 4 (A4)	male	adult	33	33	100	53	53	100	86	0.2619
T. auratus 5 (A5)	male	adult	2	2	100	3	3	100	5	0.2803
T. cristatus 1 (C1)	female	adult	12	12	100	22	22	100	34	0.8344
T. cristatus 2 (C2)	female	adult	16	16	100	27	28	100	44	0.939
T. cristatus 3 (C3)	female	adult	41	41	100	80	80	100	121	0.1077
T. cristatus 4 (C4)	female	adult	44	44	100	77	77	100	121	0.108
T. cristatus 5 (C5)	male	adult	14	15	93.33	26	27	96.30	42	0.9487
T. cristatus 6 (C6)	male	adult	4	4	100	8	8	100	12	0.7788
N. larvatus (N)	male	adult	7	7	100	17	17	100	24	0.8961
M. hecki	male	adult	0	10	0	12	12	100	22	2.20 × 10−16

^aProbability that the proportion of acceptance in the PTC-treated session is the same as that in the control session [10].