condition mean min max ZT0-3 8.48669 7.98262 8.99076 ZT4-7 6.5943000000000005 6.5943000000000005 6.5943000000000005 ZT8-11 5.37571 5.37571 5.37571 ZT12-15 0 0 0 ZT16-19 7.852304999999999 7.852304999999999 7.852304999999999 ZT20-23 11.29955 11.29955 11.29955