condition mean min max ZT0-3 12.288245 10.295390000000001 14.281099999999999 ZT4-7 5.062145 5.062145 5.062145 ZT8-11 5.575654999999999 5.575654999999999 5.575654999999999 ZT12-15 0 0 0 ZT16-19 7.537545 7.537545 7.537545 ZT20-23 7.70303 7.70303 7.70303