condition mean min max ZT0-3 44.23415 39.73865 53.05545 ZT4-7 75.79715 75.79715 75.79715 ZT8-11 50.33525 50.33525 50.33525 ZT12-15 58.98635 51.18675 66.78595 ZT16-19 53.7284 53.7284 53.7284 ZT20-23 46.1905 46.1905 46.1905