condition mean min max ZT0-3 28.0034 28.0034 28.0034 ZT4-7 27.4538 27.4538 27.4538 ZT8-11 19.118499999999997 19.118499999999997 19.118499999999997 ZT12-15 23.020400000000002 23.020400000000002 23.020400000000002 ZT16-19 26.772350000000003 26.772350000000003 26.772350000000003 ZT20-23 25.145 25.145 25.145