condition mean min max ZT0-3 0.5214523042500001 0.503990962 0.5389136465000001 ZT4-7 1.0910178225 0.6787106315 1.5033250135 ZT8-11 2.33724926425 1.8997778745 2.7747206540000002 ZT12-15 3.793164366 3.0775611165 4.5087676155 ZT16-19 3.0167672425000003 2.4470010995 3.5865333855 ZT20-23 3.95292193875 3.675275235 4.2305686425