condition mean min max ZT0-3 70.420259 70.420259 70.420259 ZT4-7 63.271471 63.271471 63.271471 ZT8-11 57.147204 57.147204 57.147204 ZT12-15 96.504683 96.504683 96.504683 ZT16-19 94.1598655 94.1598655 94.1598655 ZT20-23 194.430313 194.430313 194.430313