condition mean min max ZT0-3 19.0426 19.0426 19.0426 ZT4-7 14.00225 14.00225 14.00225 ZT8-11 12.3329 12.3329 12.3329 ZT12-15 13.5678 13.5678 13.5678 ZT16-19 13.74195 13.74195 13.74195 ZT20-23 16.65675 16.65675 16.65675