condition mean min max ZT0-3 663.7 663.7 663.7 ZT4-7 473.6 473.6 473.6 ZT8-11 527.45 527.45 527.45 ZT12-15 638.35 638.35 638.35 ZT16-19 653.1500000000001 653.1500000000001 653.1500000000001 ZT20-23 502.05 502.05 502.05