condition mean min max ZT0-3 7.529927499999999 6.911935 8.14792 ZT4-7 10.478375 10.478375 10.478375 ZT8-11 10.8665 10.8665 10.8665 ZT12-15 0 0 0 ZT16-19 10.132349999999999 10.132349999999999 10.132349999999999 ZT20-23 10.95645 10.95645 10.95645