condition mean min max ZT0-3 8.48506 6.182345 11.888950000000001 ZT4-7 5.4764 5.4764 5.4764 ZT8-11 7.7814250000000005 7.7814250000000005 7.7814250000000005 ZT12-15 11.1782 11.02 11.3364 ZT16-19 13.153500000000001 13.153500000000001 13.153500000000001 ZT20-23 12.408 12.408 12.408