condition mean min max ZT0-3 50.0434 49.66545 50.42135 ZT4-7 49.45295 49.45295 49.45295 ZT8-11 68.01245 68.01245 68.01245 ZT12-15 0 0 0 ZT16-19 106.26065 106.26065 106.26065 ZT20-23 76.42015 76.42015 76.42015