condition mean min max ZT0-3 267.3 267.3 267.3 ZT4-7 81.4 81.4 81.4 ZT8-11 111.55 111.55 111.55 ZT12-15 116.4 116.4 116.4 ZT16-19 195.3 195.3 195.3 ZT20-23 245.85 245.85 245.85