Determinants of quality of life changes with plasmapheresis in patients with myasthenia gravis

Table 6 Relation between thymectomy of the studied patients and studied scores

		Thymectomy		Test value	P value	Sig.
Total (81 patients)		Negative (29 patients)	Positive (52 patients)	Test value	P value	Sig.
Initial QMG score	Mean ± SD	23.34 ± 3.15	26.92 ± 3.78	−4.322^a	0.001	HS
Initial QMG score	Range	18-30	19-34	−4.322^a	0.001	HS
QMG score after 1 month	Mean ± SD	17.62 ± 2.65	18.29 ± 4.75	−0.697^a	0.488	NS
QMG score after 1 month	Range	12-22	11-30	−0.697^a	0.488	NS
QMG change	Median (IQR)	−19.23 (−33.33-−11.11)	−32.07 (−42.21-−21.13)	−2.660^b	0.008	HS
QMG change	Range	−55.56-0	−58.06-0	−2.660^b	0.008	HS
Test value		5.888	9.011
P value		0.001	0.001
Initial QOL score	Mean ± SD	44.17 ± 4.44	47.75 ± 4.65	−3.374^a	0.001	HS
Initial QOL score	Range	36-53	39-57	−3.374^a	0.001	HS
QOL score after 1 month	Mean ± SD	37.76 ± 5.05	38.69 ± 7.47	−0.600^a	0.550	NS
QOL score after 1 month	Range	30-48	25-54	−0.600^a	0.550	NS
QOL change	Median (IQR)	−12.5 (−20.93-−8.33)	−17.21 (−29.41-−10.42)	−1.734^b	0.083	NS
QOL change	Range	−35.29-4.44	−50-8.16	−1.734^b	0.083	NS
Test value		5.150	7.360
P value		0.001	0.001

NS non-significant, S significant, HS highly significant, QOL quality of life, QMG quantitative myasthenia gravis, SD standard deviation
^aIndependent t test
^bMann-Whitney test