condition mean min max ZT0-3 12.25385 0.0 36.76155 ZT4-7 4.154365 4.154365 4.154365 ZT8-11 0.0 0.0 0.0 ZT12-15 16.745225 8.84285 24.6476 ZT16-19 0.0 0.0 0.0 ZT20-23 9.533 9.533 9.533