condition mean min max ZT0-3 31.3628 30.07275 32.65285 ZT4-7 18.022100000000002 18.022100000000002 18.022100000000002 ZT8-11 17.11405 17.11405 17.11405 ZT12-15 0 0 0 ZT16-19 26.836 26.836 26.836 ZT20-23 34.95985 34.95985 34.95985