Table 4.

HRs with 95% CIs of mortality between 90 days and 5 years in a subgroup analyses of the most common types of reoperations after oesophagectomy, based on 1822 patients undergoing oesophageal cancer surgery in 1987–2012 in Sweden

Type of reoperation	Number of patients (%)	HR (95% CI)*,†
Exploratory laparotomy	47 (19)	1.17 (0.82 to 1.67)
Reoperation for anastomotic insufficiency	43 (17)	1.82 (1.19 to 2.76)
Wound revision	50 (20)	1.32 (0.87 to 2.00)

*Adjusted for sex, age, comorbidities, tumour stage, histology, neoadjuvant therapy, radicality, surgeon volume and calendar period.

†Missing values of covariates were missing at random and considered as a separate group.