condition mean min max ZT0-3 167.094346 167.094346 167.094346 ZT4-7 194.4315215 194.4315215 194.4315215 ZT8-11 327.65838799999995 327.65838799999995 327.65838799999995 ZT12-15 172.78617450000002 172.78617450000002 172.78617450000002 ZT16-19 175.0528275 175.0528275 175.0528275 ZT20-23 123.1523555 123.1523555 123.1523555