condition mean min max ZT0-3 67.494249 67.494249 67.494249 ZT4-7 103.044657 103.044657 103.044657 ZT8-11 131.0835775 131.0835775 131.0835775 ZT12-15 103.8841515 103.8841515 103.8841515 ZT16-19 83.668319 83.668319 83.668319 ZT20-23 62.42161 62.42161 62.42161