condition mean min max ZT0-3 5.010037913750001 4.074934926 5.9451409015 ZT4-7 14.4241750575 9.410716755 19.43763336 ZT8-11 14.40665905 12.386791315 16.426526785 ZT12-15 3.23405337625 0.726669611 5.7414371415 ZT16-19 0.19466255799999999 0.1384277135 0.2508974025 ZT20-23 0.09626028250000002 0.08835342700000001 0.104167138