condition mean min max ZT0-3 91.0 91.0 91.0 ZT4-7 129.0 129.0 129.0 ZT8-11 130.6 130.6 130.6 ZT12-15 116.2 116.2 116.2 ZT16-19 146.4 146.4 146.4 ZT20-23 98.15 98.15 98.15