condition mean min max ZT0-3 14.35 14.35 14.35 ZT4-7 10.4 10.4 10.4 ZT8-11 9.1 9.1 9.1 ZT12-15 10.600000000000001 10.600000000000001 10.600000000000001 ZT16-19 1.5 1.5 1.5 ZT20-23 11.65 11.65 11.65