condition mean min max ZT0-3 0.06110633 0.0 0.12221266 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.11303062175000002 0.052464792 0.17359645150000003 ZT16-19 0.220007698 0.16710716650000002 0.2729082295 ZT20-23 0.240546539 0.1683562915 0.31273678650000003