condition mean min max ZT0-3 15.2 15.2 15.2 ZT4-7 18.2 18.2 18.2 ZT8-11 27.45 27.45 27.45 ZT12-15 24.65 24.65 24.65 ZT16-19 9.899999999999999 9.899999999999999 9.899999999999999 ZT20-23 10.100000000000001 10.100000000000001 10.100000000000001