Korea 2007.

Methods	1989 to 1998 RCT
Participants	111 patients Stages II, III Trial data used in subgroup analyses for sex, age, histology, stage and nodal status
Interventions	Surgery + radiotherapy vs surgery alone RT details 50.4 to 55.8 Gy in 1.8 to 2 Gy fractions, 5 times a week Prescription technique: at midplane Average field size: defined inferiorly by a point 5 cm below the carina and superiorly by the suprasternal notch Clinical target volume: tumour bed, bronchial stump, ipsilateral hilum, vascular shadows of the bilateral mediastinum Technique: combination of parallel opposed, and anterior and posterior oblique fields, or any combination chosen at the discretion of the chest radiation oncologist
Outcomes	Survival
Notes	Abstract only
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Comment: stated as randomised in paper; checks run on IPD suggest adequate sequence generation
Allocation concealment (selection bias)	Low risk	Comment: insufficient information provided in abstract, but collection of IPD and correspondence with those who supplied the data reassured that data were adequate
Blinding (performance bias and detection bias) All outcomes	Low risk	Comment: trial not blinded owing to the nature of the intervention; outcome not likely influenced by lack of blinding
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: individual participant data obtained and checked for all outcomes
Selective reporting (reporting bias)	Low risk	Comment: individual participant data obtained and checked for all outcomes
Other bias	Low risk	Comment: study apparently free of other sources of bias