condition mean min max ZT0-3 414.996306 414.996306 414.996306 ZT4-7 492.751013 492.751013 492.751013 ZT8-11 419.648766 419.648766 419.648766 ZT12-15 557.0536985 557.0536985 557.0536985 ZT16-19 517.1831365 517.1831365 517.1831365 ZT20-23 476.1210455 476.1210455 476.1210455