condition mean min max ZT0-3 18.1124 18.1124 18.1124 ZT4-7 12.9825 12.9825 12.9825 ZT8-11 14.507200000000001 14.507200000000001 14.507200000000001 ZT12-15 13.8461 13.8461 13.8461 ZT16-19 21.78775 21.78775 21.78775 ZT20-23 18.974 18.974 18.974