Table 4.

CT contractility index (CI) of the same segment, presented on Table 4, on progress “post-BTA scan 2” (noting “post-BTA scan 1” as the earliest post-BTA measurements obtained pre-operatively).

Case	Muscle layer	Right side CT contractility index						Left side CT contractility index
		Anterior			Posterior			Anterior			Posterior
		Pre BTA	Post BTA 1	Post BTA 2	Pre BTA	Post BTA 1	Post BTA 2	Pre BTA	Post BTA 1	Post BTA 2	Pre BTA	Post BTA 1	Post BTA 2
1 (300U BTA)	EO	31	−42	−52	−14	−3	6	14	−24	−2	2	−22	92
	IO	15	−36	−54	−24	−11	−18	44	−4	−15	6	6	70
	TA	−1	−17	−28	12	34	−12	25	−5	−2	30	−24	−11
2 (300U BTA)	EO	26	−17	−11	45	−12	2	−4	−19	−23	16	7	−13
	IO	24	−29	−46	114	16	−9	5	−46	−22	43	12	4
	TA	−3	18	−2	−7	−29	−25	−14	−32	−13	−12	−25	10
3 (300U BTA) probable EMG side mislabeled	EO	−2	−22	7	−8	−14	158	2	−22	17	18	2	40
	IO	10	−15	2	4	9	−15	35	0	82	17	142	84
	TA	31	−38	30	36	−7	21	18	−18	63	37	55	31
4 (300U BTA)	EO	176	115	11	24	75	67	39	−10	20	38	40	19
	IO	41	30	7	68	108	99	95	−15	23	65	78	84
	TA	90	−4	80	87	33	−19	52	−2	5	174	49	16
5 (300U BTA)	EO	36	24	−35	29	22	35	23	−28	2	35	−29	2
	IO	57	−47	−63	64	78	90	97	−12	−48	27	56	107
	TA	10	−38	9	55	8	56	39	−31	−38	58	7	23
6 (200U BTA)	EO	25	−5	7	18	−16	15	40	−2	4	−1	−2	4
	IO	36	−25	25	28	46	37	30	17	18	69	22	27
	TA	67	42	48	48	14	24	145	−31	−5	71	66	4
7 (200U BTA)	EO	13	5	2	18	37	48	18	8	3	0	23	53
	IO	−2	−3	87	32	53	63	−28	−6	65	3	32	34
	TA	3	42	16	33	67	77	53	69	66	52	50	89
8 (200U BTA)	EO	25	−5	−9	37	97	14	23	12	1	24	12	31
	IO	75	14	22	−38	−16	−15	27	−21	−66	−12	−34	−4
	TA	79	A	N	6	−1	−3	36	5	−54	−10	−35	−61
9 (200U BTA)	EO	13	5	N	54	11	5	25	−14	1	91	0	7
	IO	88	24	107	18	−33	20	62	−39	37	58	−38	14
	TA	122	22	43	85	7	−16	34	−8	17	54	−11	−44
10 (200U BTA)	EO	28	7	8	26	24	17	11	−6	10	58	50	21
	IO	90	8	58	110	44	3	102	57	38	19	67	79
	TA	24	0	−5	160	−8	30	18	3	69	107	39	110
11 (200U BTA)	EO	24	−25	23	28	4	29	26	−29	14	56	74	14
	IO	119	−53	16	70	15	46	56	−40	55	82	72	86
	TA	28	−41	68	40	−24	−14	85	−6	15	115	−12	6

Positive CI values indicate an increase in muscle thickness on crunching (i.e., declining BTA effect with now contractile muscle). Negative CI values indicate a decrease in muscle thickness on crunching (i.e., persisting BTA effect with flaccid non-contractile muscle).