condition mean min max ZT0-3 2.3378525 2.15372 2.521985 ZT4-7 1.944405 1.944405 1.944405 ZT8-11 1.41422 1.41422 1.41422 ZT12-15 0 0 0 ZT16-19 2.74418 2.74418 2.74418 ZT20-23 2.12873 2.12873 2.12873