condition mean min max ZT0-3 4.7414676755 4.3170435860000005 5.165891765 ZT4-7 2.095944574 1.802336779 2.389552369 ZT8-11 2.1360514075 1.621803544 2.6502992709999997 ZT12-15 58.66432118624999 46.7593183175 70.569324055 ZT16-19 69.9900949325 55.113052705 84.86713716 ZT20-23 49.757777787500004 43.65655307 55.859002505