condition mean min max ZT0-3 34.837814944 6.161695957 63.513933931 ZT4-7 373.62742634999995 257.64783925 489.60701344999995 ZT8-11 786.71689655 753.02497615 820.4088169500001 ZT12-15 1093.759298075 993.94389755 1193.5746986000001 ZT16-19 379.262204575 343.5206505 415.00375865 ZT20-23 293.066639175 272.31208975 313.8211886