condition mean min max ZT0-3 452.562328 452.562328 452.562328 ZT4-7 426.638424 426.638424 426.638424 ZT8-11 357.865112 357.865112 357.865112 ZT12-15 376.7234895 376.7234895 376.7234895 ZT16-19 378.2386855 378.2386855 378.2386855 ZT20-23 322.2218835 322.2218835 322.2218835