condition mean min max ZT0-3 8.0592025 6.982754999999999 9.13565 ZT4-7 11.12846 11.12846 11.12846 ZT8-11 6.008435 6.008435 6.008435 ZT12-15 0 0 0 ZT16-19 4.7170950000000005 4.7170950000000005 4.7170950000000005 ZT20-23 10.174900000000001 10.174900000000001 10.174900000000001