condition mean min max ZT0-3 9.495006666666665 5.61728 13.166799999999999 ZT4-7 5.316985 5.316985 5.316985 ZT8-11 5.84027 5.84027 5.84027 ZT12-15 7.49958 6.60968 8.38948 ZT16-19 9.60028 9.60028 9.60028 ZT20-23 13.50455 13.50455 13.50455