condition mean min max ZT0-3 4.798303333333333 3.942825 5.58228 ZT4-7 4.893739999999999 4.893739999999999 4.893739999999999 ZT8-11 4.884965 4.884965 4.884965 ZT12-15 3.5144775 3.4423399999999997 3.586615 ZT16-19 3.446395 3.446395 3.446395 ZT20-23 5.588265 5.588265 5.588265