condition mean min max ZT0-3 24.554816 24.554816 24.554816 ZT4-7 28.14383 28.14383 28.14383 ZT8-11 23.9682385 23.9682385 23.9682385 ZT12-15 19.944905 19.944905 19.944905 ZT16-19 19.988844 19.988844 19.988844 ZT20-23 21.188159499999998 21.188159499999998 21.188159499999998