condition mean min max ZT0-3 407.2 407.2 407.2 ZT4-7 57.6 57.6 57.6 ZT8-11 213.45 213.45 213.45 ZT12-15 281.34999999999997 281.34999999999997 281.34999999999997 ZT16-19 389.8 389.8 389.8 ZT20-23 223.35 223.35 223.35