condition mean min max ZT0-3 434.224719 434.224719 434.224719 ZT4-7 148.865746 148.865746 148.865746 ZT8-11 155.207519 155.207519 155.207519 ZT12-15 44.048834 44.048834 44.048834 ZT16-19 38.621259 38.621259 38.621259 ZT20-23 85.4988305 85.4988305 85.4988305