condition mean min max ZT0-3 25.05745 23.5473 26.5676 ZT4-7 19.3242 19.3242 19.3242 ZT8-11 5.002855 5.002855 5.002855 ZT12-15 0 0 0 ZT16-19 18.241300000000003 18.241300000000003 18.241300000000003 ZT20-23 22.1038 22.1038 22.1038