condition mean min max ZT0-3 23.967599999999997 23.967599999999997 23.967599999999997 ZT4-7 20.142049999999998 20.142049999999998 20.142049999999998 ZT8-11 14.88565 14.88565 14.88565 ZT12-15 18.44965 18.44965 18.44965 ZT16-19 19.6114 19.6114 19.6114 ZT20-23 22.8466 22.8466 22.8466