condition mean min max ZT0-3 1009.786902 1009.786902 1009.786902 ZT4-7 714.0775965 714.0775965 714.0775965 ZT8-11 550.483619 550.483619 550.483619 ZT12-15 560.874452 560.874452 560.874452 ZT16-19 453.210367 453.210367 453.210367 ZT20-23 410.208549 410.208549 410.208549