condition mean min max ZT0-3 20.0620225 12.186195000000001 27.93785 ZT4-7 32.5563 32.5563 32.5563 ZT8-11 44.99295 44.99295 44.99295 ZT12-15 0 0 0 ZT16-19 19.98275 19.98275 19.98275 ZT20-23 52.14575 52.14575 52.14575