condition mean min max ZT0-3 15.694084 15.694084 15.694084 ZT4-7 11.806988 11.806988 11.806988 ZT8-11 10.853006 10.853006 10.853006 ZT12-15 13.2917775 13.2917775 13.2917775 ZT16-19 11.462654 11.462654 11.462654 ZT20-23 15.9817535 15.9817535 15.9817535