condition mean min max ZT0-3 12.819725 12.42535 13.2141 ZT4-7 16.02945 16.02945 16.02945 ZT8-11 18.36215 18.36215 18.36215 ZT12-15 0 0 0 ZT16-19 18.02635 18.02635 18.02635 ZT20-23 18.115099999999998 18.115099999999998 18.115099999999998