condition mean min max ZT0-3 132.7 132.7 132.7 ZT4-7 222.7 222.7 222.7 ZT8-11 173.60000000000002 173.60000000000002 173.60000000000002 ZT12-15 157.5 157.5 157.5 ZT16-19 86.2 86.2 86.2 ZT20-23 86.55000000000001 86.55000000000001 86.55000000000001