Skip to main content

Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Table 1 Literature searching and study identification

From: Systematic review with meta-analysis of the epidemiological evidence in the 1900s relating smoking to lung cancer

  N (%)
Papers   
Identified as potentially relevant 5993 100%
Not obtainable 244 4.1%
Obtained 5749 95.9%
Did not provide relevant data at all 4901 81.8%
Satisfied inclusion criteria except less than 100 lung cancer cases 175 2.9%
Satisfied all inclusion criteria 673 11.2%
Studies   
Identified 287 100.0%
Principal 267 93.0%
Subsidiary 20 7.0%