condition mean min max ZT0-3 11.728689 11.728689 11.728689 ZT4-7 11.1553975 11.1553975 11.1553975 ZT8-11 11.5143865 11.5143865 11.5143865 ZT12-15 10.975662 10.975662 10.975662 ZT16-19 14.0610435 14.0610435 14.0610435 ZT20-23 15.0779985 15.0779985 15.0779985