condition mean min max ZT0-3 21.931182 21.931182 21.931182 ZT4-7 14.774253999999999 14.774253999999999 14.774253999999999 ZT8-11 17.962356500000002 17.962356500000002 17.962356500000002 ZT12-15 117.54343 117.54343 117.54343 ZT16-19 20.863872999999998 20.863872999999998 20.863872999999998 ZT20-23 59.506176499999995 59.506176499999995 59.506176499999995