condition mean min max ZT0-3 23.167875 22.89275 23.442999999999998 ZT4-7 23.115850000000002 23.115850000000002 23.115850000000002 ZT8-11 33.65375 33.65375 33.65375 ZT12-15 0 0 0 ZT16-19 41.7394 41.7394 41.7394 ZT20-23 32.5188 32.5188 32.5188