Table 4.

Average length of stay for ICD-9-CM codes 191.0–191.9 and 198.3 (analysis method: inverse variance, mean difference, random effects)

Primary procedure	Number of patients	ALOS (days)	ALOS (SD)	Findings	Average age (years) ± SD (P = 0.15)
LITT (17.61)	27	2.33	2.13	MD = −2.38; 95% CI −3.25 to −1.51; P < 0.00001	57.8 ± 11.2
Craniotomy (01.59)	340	4.71	3.16		54.5 ± 14.9

ALOS average length of stay, CI confidence interval, ICD-9-CM International classification of diseases, 9th revision, clinical modification, LITT laser interstitial thermal therapy, MD mean difference, SD standard deviation