condition mean min max ZT0-3 59.1 59.1 59.1 ZT4-7 13.0 13.0 13.0 ZT8-11 19.349999999999998 19.349999999999998 19.349999999999998 ZT12-15 60.0 60.0 60.0 ZT16-19 9.75 9.75 9.75 ZT20-23 29.650000000000002 29.650000000000002 29.650000000000002