condition mean min max ZT0-3 756.175344 756.175344 756.175344 ZT4-7 546.3242605 546.3242605 546.3242605 ZT8-11 446.857072 446.857072 446.857072 ZT12-15 631.8407645 631.8407645 631.8407645 ZT16-19 529.8963725 529.8963725 529.8963725 ZT20-23 766.8280855 766.8280855 766.8280855