condition mean min max ZT0-3 14.0268175 10.399835 17.6538 ZT4-7 5.544525 5.544525 5.544525 ZT8-11 2.07766 2.07766 2.07766 ZT12-15 0 0 0 ZT16-19 18.01425 18.01425 18.01425 ZT20-23 18.4008 18.4008 18.4008