condition mean min max ZT0-3 196.06683333333334 163.975 212.3395 ZT4-7 182.428 182.428 182.428 ZT8-11 187.0905 187.0905 187.0905 ZT12-15 263.62874999999997 223.738 303.5195 ZT16-19 244.454 244.454 244.454 ZT20-23 237.015 237.015 237.015