condition mean min max ZT0-3 53.531073 53.531073 53.531073 ZT4-7 81.3330925 81.3330925 81.3330925 ZT8-11 75.0637035 75.0637035 75.0637035 ZT12-15 76.7037935 76.7037935 76.7037935 ZT16-19 59.472865 59.472865 59.472865 ZT20-23 60.571358 60.571358 60.571358