condition mean min max ZT0-3 1.380215 1.380215 1.380215 ZT4-7 0.43999049999999995 0.43999049999999995 0.43999049999999995 ZT8-11 1.658665 1.658665 1.658665 ZT12-15 9.17417 9.17417 9.17417 ZT16-19 8.40322 8.40322 8.40322 ZT20-23 3.424995 3.424995 3.424995