condition mean min max ZT0-3 14.95 14.95 14.95 ZT4-7 37.6 37.6 37.6 ZT8-11 13.95 13.95 13.95 ZT12-15 43.3 43.3 43.3 ZT16-19 15.850000000000001 15.850000000000001 15.850000000000001 ZT20-23 24.4 24.4 24.4