condition mean min max ZT0-3 52.6 52.6 52.6 ZT4-7 51.8 51.8 51.8 ZT8-11 82.1 82.1 82.1 ZT12-15 64.1 64.1 64.1 ZT16-19 74.5 74.5 74.5 ZT20-23 70.1 70.1 70.1