condition mean min max ZT0-3 4.936865 4.46091 5.41282 ZT4-7 9.947004999999999 9.947004999999999 9.947004999999999 ZT8-11 23.3271 23.3271 23.3271 ZT12-15 0 0 0 ZT16-19 10.36176 10.36176 10.36176 ZT20-23 10.014420000000001 10.014420000000001 10.014420000000001