condition mean min max ZT0-3 11.080525 10.76725 11.393799999999999 ZT4-7 7.177975 7.177975 7.177975 ZT8-11 7.8599250000000005 7.8599250000000005 7.8599250000000005 ZT12-15 0 0 0 ZT16-19 10.60154 10.60154 10.60154 ZT20-23 10.92725 10.92725 10.92725