condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.065231 0.065231 0.065231 ZT12-15 0.024433225 0.0 0.04886645 ZT16-19 0.012789866666666665 0.0 0.02557973333333333 ZT20-23 0 0 0