condition mean min max ZT0-3 51.0 51.0 51.0 ZT4-7 77.1 77.1 77.1 ZT8-11 65.44999999999999 65.44999999999999 65.44999999999999 ZT12-15 77.65 77.65 77.65 ZT16-19 52.0 52.0 52.0 ZT20-23 70.85 70.85 70.85