condition mean min max ZT0-3 147.265044 147.265044 147.265044 ZT4-7 136.3511725 136.3511725 136.3511725 ZT8-11 125.93495250000001 125.93495250000001 125.93495250000001 ZT12-15 141.9146875 141.9146875 141.9146875 ZT16-19 131.5947595 131.5947595 131.5947595 ZT20-23 169.141925 169.141925 169.141925