condition mean min max ZT0-3 0.0838455 0.0 0.2515365 ZT4-7 0.0 0.0 0.0 ZT8-11 0.247161 0.247161 0.247161 ZT12-15 0.2132545 0.1642605 0.2622485 ZT16-19 0.6163000000000001 0.6163000000000001 0.6163000000000001 ZT20-23 0.349322 0.349322 0.349322