condition mean min max ZT0-3 5.1186925 4.843795 5.39359 ZT4-7 9.39776 9.39776 9.39776 ZT8-11 7.25365 7.25365 7.25365 ZT12-15 0 0 0 ZT16-19 9.145305 9.145305 9.145305 ZT20-23 7.890005 7.890005 7.890005