condition mean min max ZT0-3 19.548175 17.187649999999998 21.9087 ZT4-7 10.349535 10.349535 10.349535 ZT8-11 10.6523 10.6523 10.6523 ZT12-15 0 0 0 ZT16-19 13.5063 13.5063 13.5063 ZT20-23 13.5732 13.5732 13.5732