condition mean min max ZT0-3 203.0135 196.9635 209.7265 ZT4-7 237.65550000000002 237.65550000000002 237.65550000000002 ZT8-11 310.23900000000003 310.23900000000003 310.23900000000003 ZT12-15 344.12775 316.5025 371.75300000000004 ZT16-19 348.96849999999995 348.96849999999995 348.96849999999995 ZT20-23 266.61400000000003 266.61400000000003 266.61400000000003