condition mean min max ZT0-3 37.648825 34.11245 41.185199999999995 ZT4-7 20.2746 20.2746 20.2746 ZT8-11 48.54325 48.54325 48.54325 ZT12-15 0 0 0 ZT16-19 66.5097 66.5097 66.5097 ZT20-23 47.827799999999996 47.827799999999996 47.827799999999996