condition mean min max ZT0-3 83.253643 83.253643 83.253643 ZT4-7 98.688744 98.688744 98.688744 ZT8-11 115.3074785 115.3074785 115.3074785 ZT12-15 98.59553700000001 98.59553700000001 98.59553700000001 ZT16-19 166.5613345 166.5613345 166.5613345 ZT20-23 173.159574 173.159574 173.159574