condition mean min max ZT0-3 1371.830324 1371.830324 1371.830324 ZT4-7 1334.6844215 1334.6844215 1334.6844215 ZT8-11 1346.727942 1346.727942 1346.727942 ZT12-15 1613.8413110000001 1613.8413110000001 1613.8413110000001 ZT16-19 1376.2402339999999 1376.2402339999999 1376.2402339999999 ZT20-23 1425.1826194999999 1425.1826194999999 1425.1826194999999