condition mean min max ZT0-3 4.1134275 3.9016349999999997 4.32522 ZT4-7 3.882555 3.882555 3.882555 ZT8-11 4.30898 4.30898 4.30898 ZT12-15 0 0 0 ZT16-19 6.711385 6.711385 6.711385 ZT20-23 5.82352 5.82352 5.82352