condition mean min max ZT0-3 12.697596 12.697596 12.697596 ZT4-7 12.4101075 12.4101075 12.4101075 ZT8-11 13.087532 13.087532 13.087532 ZT12-15 12.3346835 12.3346835 12.3346835 ZT16-19 12.7475545 12.7475545 12.7475545 ZT20-23 12.738289 12.738289 12.738289