condition mean min max ZT0-3 51.261553317499995 15.16864564 87.354460995 ZT4-7 306.21667315 254.01882105000004 358.41452525 ZT8-11 530.180207375 450.96108925 609.3993255 ZT12-15 288.3187557925 130.669813785 445.9676978 ZT16-19 60.4631985075 44.583470995 76.34292602000001 ZT20-23 18.92694543975 13.8656941245 23.988196754999997