condition mean min max ZT0-3 531.5 531.5 531.5 ZT4-7 306.5 306.5 306.5 ZT8-11 423.35 423.35 423.35 ZT12-15 463.8 463.8 463.8 ZT16-19 494.29999999999995 494.29999999999995 494.29999999999995 ZT20-23 398.35 398.35 398.35