condition mean min max ZT0-3 5.150325 4.578049999999999 5.7226 ZT4-7 4.79238 4.79238 4.79238 ZT8-11 4.244125 4.244125 4.244125 ZT12-15 0 0 0 ZT16-19 3.27989 3.27989 3.27989 ZT20-23 4.508979999999999 4.508979999999999 4.508979999999999