condition mean min max ZT0-3 58.307125 37.46085 79.1534 ZT4-7 64.3094 64.3094 64.3094 ZT8-11 32.19345 32.19345 32.19345 ZT12-15 0 0 0 ZT16-19 57.96355 57.96355 57.96355 ZT20-23 68.62559999999999 68.62559999999999 68.62559999999999