condition mean min max ZT0-3 10.883083 10.883083 10.883083 ZT4-7 12.0138215 12.0138215 12.0138215 ZT8-11 10.9685615 10.9685615 10.9685615 ZT12-15 12.531203999999999 12.531203999999999 12.531203999999999 ZT16-19 12.9798315 12.9798315 12.9798315 ZT20-23 13.8725475 13.8725475 13.8725475