condition mean min max ZT0-3 9.207749999999999 5.302 11.59675 ZT4-7 0.0 0.0 0.0 ZT8-11 5.3337 5.3337 5.3337 ZT12-15 2.65855 0.0 5.3171 ZT16-19 0.0 0.0 0.0 ZT20-23 11.41105 11.41105 11.41105