condition mean min max ZT0-3 0.8198430000000001 0.8198430000000001 0.8198430000000001 ZT4-7 0.6618379999999999 0.6618379999999999 0.6618379999999999 ZT8-11 0.7136105 0.7136105 0.7136105 ZT12-15 1.7085400000000002 1.7085400000000002 1.7085400000000002 ZT16-19 2.3295250000000003 2.3295250000000003 2.3295250000000003 ZT20-23 1.138704 1.138704 1.138704