tokens: Mean latency periods were 29 . 6 among insulators , 35 . 4 among dock workers , 43 . 7 in a heterogeneous group defined as various , 46 . 4 in non - shipbuilding industry workers , 49 . 4 in shipyard workers , 51 . 7 among women with a history of domestic exposure to asbestos , and 56 . 2 in people employed in maritime trades .