Risk factors of postoperative cerebral hyperperfusion syndrome and its relationship with clinical prognosis in adult patients with moyamoya disease

Table 4 Comparison of clinical follow-up outcome for MMD cases with and without postoperative CHS

Characteristic	Postoperative CHS		t/χ²	P-value
Characteristic	Absent (n = 122)	Present (n = 11)	t/χ²	P-value
Mean mRS at discharge	0.99 ± 0.68	1.42 ± 0.52	−2.013	0.036*
Follow-up (months)	37.97 ± 12.35	43.33 ± 12.26	−1.449	0.149
New complications	15 (12.3%)	3 (27.3%)	1.934	0.171
TIA	8 (6.56%)	2 (18.18%)
Infarction	6 (4.92%)	1 (9.09%)
Hemorrhage	1 (0.82%)	0 (0%)
Mean mRS at follow-up	0.91 ± 0.68	1.36 ± 1.12	−1.335	0.211