condition mean min max ZT0-3 34.93519333333333 16.64068 54.56415 ZT4-7 8.04737 8.04737 8.04737 ZT8-11 4.147295 4.147295 4.147295 ZT12-15 25.4256 24.9007 25.950499999999998 ZT16-19 4.020985 4.020985 4.020985 ZT20-23 35.141545 35.141545 35.141545