condition mean min max ZT0-3 213.582926 213.582926 213.582926 ZT4-7 131.140573 131.140573 131.140573 ZT8-11 179.646297 179.646297 179.646297 ZT12-15 132.14433350000002 132.14433350000002 132.14433350000002 ZT16-19 138.9655775 138.9655775 138.9655775 ZT20-23 116.2510355 116.2510355 116.2510355