condition mean min max ZT0-3 42.0136 42.0136 42.0136 ZT4-7 51.3939 51.3939 51.3939 ZT8-11 25.6358 25.6358 25.6358 ZT12-15 21.53705 21.53705 21.53705 ZT16-19 23.030099999999997 23.030099999999997 23.030099999999997 ZT20-23 35.87535 35.87535 35.87535