condition mean min max ZT0-3 31.666952 31.666952 31.666952 ZT4-7 31.709243 31.709243 31.709243 ZT8-11 40.4574835 40.4574835 40.4574835 ZT12-15 38.301769 38.301769 38.301769 ZT16-19 34.016667999999996 34.016667999999996 34.016667999999996 ZT20-23 34.065508 34.065508 34.065508