condition mean min max ZT0-3 44.912949999999995 38.8251 51.0008 ZT4-7 48.08265 48.08265 48.08265 ZT8-11 31.6895 31.6895 31.6895 ZT12-15 0 0 0 ZT16-19 28.8669 28.8669 28.8669 ZT20-23 31.4056 31.4056 31.4056