condition mean min max ZT0-3 2562.8 2562.8 2562.8 ZT4-7 3399.2 3399.2 3399.2 ZT8-11 3364.3999999999996 3364.3999999999996 3364.3999999999996 ZT12-15 3227.95 3227.95 3227.95 ZT16-19 3067.0 3067.0 3067.0 ZT20-23 2756.45 2756.45 2756.45