condition mean min max ZT0-3 1.2185487460000002 0.548886709 1.8882107830000001 ZT4-7 7.037238083 3.2221165955 10.852359570499999 ZT8-11 14.72540366725 14.6112788245 14.839528510000001 ZT12-15 3.1077877732499997 1.487057557 4.728517989499999 ZT16-19 0.20853560675 0.18896816349999998 0.22810305 ZT20-23 0.06578597750000001 0.045853198 0.085718757