condition mean min max ZT0-3 214.111664 214.111664 214.111664 ZT4-7 183.779226 183.779226 183.779226 ZT8-11 198.1372365 198.1372365 198.1372365 ZT12-15 213.1609055 213.1609055 213.1609055 ZT16-19 232.42109349999998 232.42109349999998 232.42109349999998 ZT20-23 225.27542599999998 225.27542599999998 225.27542599999998