condition mean min max ZT0-3 39.152143 39.152143 39.152143 ZT4-7 14.8507015 14.8507015 14.8507015 ZT8-11 13.6969815 13.6969815 13.6969815 ZT12-15 10.451237 10.451237 10.451237 ZT16-19 11.12898 11.12898 11.12898 ZT20-23 11.7095415 11.7095415 11.7095415