condition mean min max ZT0-3 8.792258 8.792258 8.792258 ZT4-7 9.643014 9.643014 9.643014 ZT8-11 10.227119 10.227119 10.227119 ZT12-15 9.953245500000001 9.953245500000001 9.953245500000001 ZT16-19 10.239666 10.239666 10.239666 ZT20-23 9.379696500000001 9.379696500000001 9.379696500000001