condition mean min max ZT0-3 10.310816666666668 6.851195000000001 13.501100000000001 ZT4-7 7.394324999999999 7.394324999999999 7.394324999999999 ZT8-11 9.758590000000002 9.758590000000002 9.758590000000002 ZT12-15 10.89285 10.0659 11.7198 ZT16-19 11.6439 11.6439 11.6439 ZT20-23 13.0789 13.0789 13.0789