condition mean min max ZT0-3 48.7 48.7 48.7 ZT4-7 43.7 43.7 43.7 ZT8-11 34.75 34.75 34.75 ZT12-15 36.7 36.7 36.7 ZT16-19 11.4 11.4 11.4 ZT20-23 70.15 70.15 70.15