condition mean min max ZT0-3 42.288273 42.288273 42.288273 ZT4-7 32.210138 32.210138 32.210138 ZT8-11 40.387955500000004 40.387955500000004 40.387955500000004 ZT12-15 43.7517095 43.7517095 43.7517095 ZT16-19 43.604891499999994 43.604891499999994 43.604891499999994 ZT20-23 48.5744665 48.5744665 48.5744665