condition mean min max ZT0-3 19.6802 19.33185 20.02855 ZT4-7 21.3097 21.3097 21.3097 ZT8-11 14.14675 14.14675 14.14675 ZT12-15 0 0 0 ZT16-19 16.40685 16.40685 16.40685 ZT20-23 24.6007 24.6007 24.6007