condition mean min max ZT0-3 136.122933 136.122933 136.122933 ZT4-7 138.167364 138.167364 138.167364 ZT8-11 127.93114 127.93114 127.93114 ZT12-15 164.4290365 164.4290365 164.4290365 ZT16-19 115.9865685 115.9865685 115.9865685 ZT20-23 165.171111 165.171111 165.171111