condition mean min max ZT0-3 9.838417 9.838417 9.838417 ZT4-7 10.4003675 10.4003675 10.4003675 ZT8-11 9.674134 9.674134 9.674134 ZT12-15 10.0012435 10.0012435 10.0012435 ZT16-19 9.621639 9.621639 9.621639 ZT20-23 10.127718000000002 10.127718000000002 10.127718000000002