condition mean min max ZT0-3 1.77713896175 1.6405068985 1.913771025 ZT4-7 1.11887991175 0.893254174 1.3445056494999998 ZT8-11 1.7709424275 1.484068186 2.057816669 ZT12-15 1.01147633 0.9148454055 1.1081072545 ZT16-19 0.9454301887500001 0.7654084030000001 1.1254519745 ZT20-23 1.0455470447500002 1.0287804155 1.062313674