condition mean min max ZT0-3 0.8342940000000001 0.7254465 0.9431415000000001 ZT4-7 1.038003 1.038003 1.038003 ZT8-11 1.492415 1.492415 1.492415 ZT12-15 0 0 0 ZT16-19 1.614495 1.614495 1.614495 ZT20-23 1.735905 1.735905 1.735905