Table 4.

Changes and differences in spine extensor strength.

	Mean change*		Mean change†		Mean difference‡
	ABBG (n = 33)	CG (n = 34)	ABBG (n = 33)	CG (n = 34)
0°	19.8 (13.0; 26.6)¶	25.5 (18.8; 32.2)¶	30.4 (22.2; 38.6)ǁ	41.1 (33.1; 49.2)¶	−10.8 (−22.3; 0.7)
12°	24.4 (17.5; 31.2)¶	26.1 (19.3; 32.9)¶	38.1 (29.6; 46.6)¶	36.5 (28.1; 44.9)ǁ	1.7 (−10.3; 13.6)
24°	27.1 (21.0; 33.1)¶	25.8 (19.8; 31.7)¶	38.3 (29.6; 47.1)¶	38.4 (29.8; 47.0)¶	−0.1 (−12.4; 12.1)
36°	27.5 (20.3; 34.7)¶	23.1 (16.1; 30.2)*¶	44.4 (34.8; 54.0)¶	38.1 (28.6; 47.5)¶	6.4 (−7.1; 19.8)
48°	30.6 (24.2; 37.0)¶	24.5 (18.2; 30.8)¶	46.4 (37.6; 55.2)¶	39.5 (30.8; 48.1)¶	6.9 (−5.4; 19.2)
60°	30.2 (24.3; 36.2)¶	23.3 (17.5; 29.2)¶	49.7 (40.8; 58.6)¶	36.7 (27.9; 45.5)¶	13.0§ (0.5; 25.5)
72°	36.5 (30.6; 42.5)¶	27.3 (21.5; 33.2)¶	59.5 (52.8; 66.2)¶	42.5 (35.9; 49.1)¶	17.0§ (7.6; 26.5)¶

ABBG = abdominal bracing group, CG = control group.

^*Mean change within the group from baseline to 12 wk (95% confidence interval).

^†Mean change within the group from baseline to 24 wk (95% confidence interval).

^‡Mean difference between groups for mean change from baseline to 24 wk (two-way repeated measures analysis of variance; 95% confidence interval).

^§P < .05.

^ǁP < .01.

^¶P < .001.