condition mean min max ZT0-3 5.016685000000001 4.6254800000000005 5.40789 ZT4-7 5.80186 5.80186 5.80186 ZT8-11 7.72171 7.72171 7.72171 ZT12-15 8.407802499999999 8.063665 8.75194 ZT16-19 7.202796666666666 6.454123333333333 7.95147 ZT20-23 0 0 0