condition mean min max ZT0-3 5.2907150000000005 4.89236 5.68907 ZT4-7 4.32243 4.32243 4.32243 ZT8-11 2.7746 2.7746 2.7746 ZT12-15 0 0 0 ZT16-19 4.805405 4.805405 4.805405 ZT20-23 5.909565 5.909565 5.909565