condition mean min max ZT0-3 237.1 237.1 237.1 ZT4-7 159.1 159.1 159.1 ZT8-11 188.5 188.5 188.5 ZT12-15 215.7 215.7 215.7 ZT16-19 250.5 250.5 250.5 ZT20-23 249.6 249.6 249.6