Timing of surgical operation for patients with intra-abdominal infection: A systematic review and meta-analysis

Table 1 Characteristics of included studies

Ref.	Design	Sample size, n	Age in year	Sex, male/female	Start of time calculation	Primary end-point(s)	Follow-up time
Elramah et al[24]	RC	523	61	-	Admission time	Mortality rate; Cure rate	9 year
Giraudo et al[23]	RC	746	28.8	343/380	Admission time	Complications rate; Mortality rate	6 year
Lee et al[25]	RC	1076	35.2 ± 17.1	612/464	Time of symptom onset	Cure rate; Complications rate	3 year
Maroju et al[28]	PC	114	28.3	86/28	Time of symptom onset	Length of hospital stay	1 year
Kim et al[29]	RC	192	33.6 ± 19.5	99/93	Time of symptom onset	Complications rate; Length of hospital stay	1 year
Saar et al[30]	PC	270	35.4 ± 14.8	136/130	Time of symptom onset	Cure rate	1 year
Rause et al[22]	RC	197	68	51%/49%	Admission time	Mortality rate	8 year
Azuhata et al[26]	PC	154	66.5 ± 13.9	88/66	Admission time	Survival rate	4 year
Wen and Tang[27]	RC	101	56.26 ± 15.7	65/36	Admission time	Mortality rate; Length of hospital stay	3.5 year

PC: Prospective cohort; RC: Randomized controlled.