condition mean min max ZT0-3 36.9 36.9 36.9 ZT4-7 8.1 8.1 8.1 ZT8-11 39.0 39.0 39.0 ZT12-15 35.4 35.4 35.4 ZT16-19 28.55 28.55 28.55 ZT20-23 10.850000000000001 10.850000000000001 10.850000000000001