condition mean min max ZT0-3 281.9 281.9 281.9 ZT4-7 284.2 284.2 284.2 ZT8-11 217.1 217.1 217.1 ZT12-15 223.0 223.0 223.0 ZT16-19 304.6 304.6 304.6 ZT20-23 299.8 299.8 299.8