condition mean min max ZT0-3 8.1571925 8.022855 8.29153 ZT4-7 5.34341 5.34341 5.34341 ZT8-11 4.94567 4.94567 4.94567 ZT12-15 0 0 0 ZT16-19 9.511255 9.511255 9.511255 ZT20-23 10.024370000000001 10.024370000000001 10.024370000000001