condition mean min max ZT0-3 2859.6000000000004 2859.6000000000004 2859.6000000000004 ZT4-7 3510.7 3510.7 3510.7 ZT8-11 3401.95 3401.95 3401.95 ZT12-15 3122.55 3122.55 3122.55 ZT16-19 2957.3999999999996 2957.3999999999996 2957.3999999999996 ZT20-23 2809.65 2809.65 2809.65