condition mean min max ZT0-3 15.476049999999999 13.275400000000001 17.676699999999997 ZT4-7 14.1969 14.1969 14.1969 ZT8-11 10.363915 10.363915 10.363915 ZT12-15 0 0 0 ZT16-19 12.55075 12.55075 12.55075 ZT20-23 13.92755 13.92755 13.92755