condition mean min max ZT0-3 0.6242445000000001 0.5371520000000001 0.711337 ZT4-7 0.37500449999999996 0.37500449999999996 0.37500449999999996 ZT8-11 0.2079444 0.2079444 0.2079444 ZT12-15 0 0 0 ZT16-19 0.16435485 0.16435485 0.16435485 ZT20-23 0.3310385 0.3310385 0.3310385