condition mean min max ZT0-3 0.21556733333333333 0.080749 0.3582705 ZT4-7 0.1609135 0.1609135 0.1609135 ZT8-11 0.45665849999999997 0.45665849999999997 0.45665849999999997 ZT12-15 0.30326664999999997 0.2014963 0.405037 ZT16-19 0.7692755 0.7692755 0.7692755 ZT20-23 0.578806 0.578806 0.578806