condition mean min max ZT0-3 7.004099999999999 5.869255 8.138945 ZT4-7 13.719000000000001 13.719000000000001 13.719000000000001 ZT8-11 23.412399999999998 23.412399999999998 23.412399999999998 ZT12-15 0 0 0 ZT16-19 23.9264 23.9264 23.9264 ZT20-23 20.66395 20.66395 20.66395