condition mean min max ZT0-3 578.108492 578.108492 578.108492 ZT4-7 430.5808955 430.5808955 430.5808955 ZT8-11 385.46468600000003 385.46468600000003 385.46468600000003 ZT12-15 383.42916049999997 383.42916049999997 383.42916049999997 ZT16-19 493.885903 493.885903 493.885903 ZT20-23 539.696545 539.696545 539.696545