condition mean min max ZT0-3 3.75166 3.75166 3.75166 ZT4-7 3.73209 3.73209 3.73209 ZT8-11 2.79942 2.79942 2.79942 ZT12-15 4.118025 4.118025 4.118025 ZT16-19 3.60325 3.60325 3.60325 ZT20-23 3.756055 3.756055 3.756055