condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.032062233333333336 0.032062233333333336 0.032062233333333336 ZT20-23 0.024513499999999997 0.024513499999999997 0.024513499999999997