LBP and insomnia measurement: The results obtained from analysis of the four groups were as follows: insomnia-LBP (rs11804386), sleep duration-LBP (rs282086 and rs12537376), short sleep duration-LBP (rs573615914, rs546786239, rs8008258, and rs74500417), and long sleep duration-LBP (rs2387776, rs73196898, rs9915132, and rs4006399).