condition mean min max ZT0-3 24.12444219 22.31089499 25.93798939 ZT4-7 26.6908234325 25.88851314 27.493133725 ZT8-11 27.141686632499997 25.84287035 28.440502914999996 ZT12-15 24.866566317500002 24.66389204 25.069240595 ZT16-19 29.963971569999998 26.580292184999998 33.347650955 ZT20-23 39.9899236425 38.581827520000004 41.398019765