condition mean min max ZT0-3 0.335324 0.203736 0.4049255 ZT4-7 0.22058650000000002 0.22058650000000002 0.22058650000000002 ZT8-11 0.0853691 0.0853691 0.0853691 ZT12-15 0.46420300000000003 0.363241 0.565165 ZT16-19 0.34817050000000005 0.34817050000000005 0.34817050000000005 ZT20-23 0.398386 0.398386 0.398386