condition mean min max ZT0-3 408.85 408.85 408.85 ZT4-7 537.8 537.8 537.8 ZT8-11 502.04999999999995 502.04999999999995 502.04999999999995 ZT12-15 522.95 522.95 522.95 ZT16-19 406.45 406.45 406.45 ZT20-23 346.55 346.55 346.55