condition mean min max ZT0-3 25.35585 24.87845 25.83325 ZT4-7 26.27335 26.27335 26.27335 ZT8-11 20.106 20.106 20.106 ZT12-15 0 0 0 ZT16-19 25.346049999999998 25.346049999999998 25.346049999999998 ZT20-23 25.52835 25.52835 25.52835