condition mean min max ZT0-3 231.12716666666668 183.45499999999998 281.379 ZT4-7 142.028 142.028 142.028 ZT8-11 118.714 118.714 118.714 ZT12-15 179.912 166.5 193.324 ZT16-19 194.76999999999998 194.76999999999998 194.76999999999998 ZT20-23 278.1885 278.1885 278.1885