condition mean min max ZT0-3 41.336275 39.653850000000006 43.018699999999995 ZT4-7 22.2058 22.2058 22.2058 ZT8-11 20.12575 20.12575 20.12575 ZT12-15 0 0 0 ZT16-19 36.29325 36.29325 36.29325 ZT20-23 31.726100000000002 31.726100000000002 31.726100000000002