condition mean min max ZT0-3 257.8 257.8 257.8 ZT4-7 104.8 104.8 104.8 ZT8-11 122.3 122.3 122.3 ZT12-15 175.14999999999998 175.14999999999998 175.14999999999998 ZT16-19 204.5 204.5 204.5 ZT20-23 311.9 311.9 311.9