condition mean min max ZT0-3 472.173615 472.173615 472.173615 ZT4-7 410.245983 410.245983 410.245983 ZT8-11 479.084494 479.084494 479.084494 ZT12-15 584.2557194999999 584.2557194999999 584.2557194999999 ZT16-19 760.9137745 760.9137745 760.9137745 ZT20-23 928.632421 928.632421 928.632421