condition mean min max ZT0-3 1.5295416666666668 0.8010634999999999 2.70379 ZT4-7 0.251171 0.251171 0.251171 ZT8-11 1.3221205 1.3221205 1.3221205 ZT12-15 1.25238 0.5276 1.97716 ZT16-19 1.2593285 1.2593285 1.2593285 ZT20-23 1.42049 1.42049 1.42049