F Tuchsen et al. Occ. Env. Med. (2006) Vol.63 p 451 – 455
“A 12 year prospective study of circulatory disease among Danish shift workers”
The risk of incident circulatory disease was related to shift work even after all other variables had been corrected for. RR = 1.3 (95% CI = 1.1 to 1.6). The attributable fraction of circulatory disease in the whole population was estimated to be 5% (i.e. nationally, among workers, 5% of circulatory disease was attributable to shift working).