condition mean min max ZT0-3 95.117531 95.117531 95.117531 ZT4-7 82.64473749999999 82.64473749999999 82.64473749999999 ZT8-11 110.09069550000001 110.09069550000001 110.09069550000001 ZT12-15 156.716703 156.716703 156.716703 ZT16-19 204.4088955 204.4088955 204.4088955 ZT20-23 194.09760699999998 194.09760699999998 194.09760699999998