condition mean min max ZT0-3 11.79365 11.5426 12.0447 ZT4-7 8.978835 8.978835 8.978835 ZT8-11 10.64364 10.64364 10.64364 ZT12-15 0 0 0 ZT16-19 13.0443 13.0443 13.0443 ZT20-23 12.78755 12.78755 12.78755