condition mean min max ZT0-3 0.24701225 0.19501849999999998 0.299006 ZT4-7 0.13025150000000002 0.13025150000000002 0.13025150000000002 ZT8-11 0.6489465 0.6489465 0.6489465 ZT12-15 0 0 0 ZT16-19 0.5113759999999999 0.5113759999999999 0.5113759999999999 ZT20-23 0.4493325 0.4493325 0.4493325