Italy 2002.

Methods	1989 to 1997 RCT
Participants	104 patients Stage I Trial data used in subgroup analyses for age, sex, histology and stage
Interventions	Surgery + radiotherapy vs surgery alone RT details 50.4 Gy in 1.8 Gy/d in 5 weeks and 3 days Prescription technique: angled field technique machine used: linac Average field size (cm): unavailable Clinical target volume: bronchial stump, hilum, mediastinum Technique: unavailable
Outcomes	Survival
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "by chance" using computer‐generated model Comment: stated as randomised in paper; checks run on IPD suggest adequate sequence generation
Allocation concealment (selection bias)	Low risk	Comment: computer‐generated randomisation, which was checked by an independent colleague
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