condition mean min max ZT0-3 182.760647 182.760647 182.760647 ZT4-7 211.138407 211.138407 211.138407 ZT8-11 217.23006800000002 217.23006800000002 217.23006800000002 ZT12-15 215.8471245 215.8471245 215.8471245 ZT16-19 256.4968025 256.4968025 256.4968025 ZT20-23 216.982324 216.982324 216.982324