condition mean min max ZT0-3 12.188675 11.307549999999999 13.0698 ZT4-7 10.216349999999998 10.216349999999998 10.216349999999998 ZT8-11 15.6589 15.6589 15.6589 ZT12-15 0 0 0 ZT16-19 13.8064 13.8064 13.8064 ZT20-23 15.556750000000001 15.556750000000001 15.556750000000001