condition mean min max ZT0-3 10.700704 10.700704 10.700704 ZT4-7 12.8731385 12.8731385 12.8731385 ZT8-11 11.83622 11.83622 11.83622 ZT12-15 11.4037085 11.4037085 11.4037085 ZT16-19 11.678996 11.678996 11.678996 ZT20-23 12.854828 12.854828 12.854828