condition mean min max ZT0-3 16.449591 16.449591 16.449591 ZT4-7 15.136417 15.136417 15.136417 ZT8-11 13.149398 13.149398 13.149398 ZT12-15 13.21045 13.21045 13.21045 ZT16-19 14.4221045 14.4221045 14.4221045 ZT20-23 11.319849999999999 11.319849999999999 11.319849999999999