condition mean min max ZT0-3 2002.457675 2002.457675 2002.457675 ZT4-7 1893.003249 1893.003249 1893.003249 ZT8-11 1961.1129604999999 1961.1129604999999 1961.1129604999999 ZT12-15 2140.3951555 2140.3951555 2140.3951555 ZT16-19 2534.6080355 2534.6080355 2534.6080355 ZT20-23 2365.6830200000004 2365.6830200000004 2365.6830200000004