condition mean min max ZT0-3 0.5683461107500001 0.5357087665 0.600983455 ZT4-7 0.68101526925 0.6371716190000001 0.7248589194999999 ZT8-11 0.77801638725 0.7320765604999999 0.8239562140000001 ZT12-15 0.7767258722500001 0.7517290990000001 0.8017226455 ZT16-19 0.787908479 0.7357493325 0.8400676255000001 ZT20-23 1.16342162225 1.0581941885 1.268649056