condition mean min max ZT0-3 44.293103 44.293103 44.293103 ZT4-7 59.5116685 59.5116685 59.5116685 ZT8-11 57.1502625 57.1502625 57.1502625 ZT12-15 56.168133 56.168133 56.168133 ZT16-19 68.827826 68.827826 68.827826 ZT20-23 65.9304995 65.9304995 65.9304995