condition mean min max ZT0-3 3615.084926 3615.084926 3615.084926 ZT4-7 3946.2772315 3946.2772315 3946.2772315 ZT8-11 3236.7051325 3236.7051325 3236.7051325 ZT12-15 3873.6801835 3873.6801835 3873.6801835 ZT16-19 2861.5582160000004 2861.5582160000004 2861.5582160000004 ZT20-23 2008.9418685 2008.9418685 2008.9418685