condition mean min max ZT0-3 22.457 21.525 23.389000000000003 ZT4-7 11.713305 11.713305 11.713305 ZT8-11 2.65096 2.65096 2.65096 ZT12-15 0 0 0 ZT16-19 12.4747 12.4747 12.4747 ZT20-23 17.0341 17.0341 17.0341