condition mean min max ZT0-3 3630.705874 3630.705874 3630.705874 ZT4-7 3975.804911 3975.804911 3975.804911 ZT8-11 3514.8375745000003 3514.8375745000003 3514.8375745000003 ZT12-15 3942.9876505 3942.9876505 3942.9876505 ZT16-19 3254.645554 3254.645554 3254.645554 ZT20-23 3419.624667 3419.624667 3419.624667