condition mean min max ZT0-3 145.893847 145.893847 145.893847 ZT4-7 282.3854935 282.3854935 282.3854935 ZT8-11 296.633444 296.633444 296.633444 ZT12-15 236.560354 236.560354 236.560354 ZT16-19 207.48292049999998 207.48292049999998 207.48292049999998 ZT20-23 211.6178515 211.6178515 211.6178515