condition mean min max ZT0-3 30.190424999999998 25.541 34.83985 ZT4-7 4.70165 4.70165 4.70165 ZT8-11 3.8594099999999996 3.8594099999999996 3.8594099999999996 ZT12-15 0 0 0 ZT16-19 17.841 17.841 17.841 ZT20-23 25.11225 25.11225 25.11225