condition mean min max ZT0-3 19.0295 19.0295 19.0295 ZT4-7 12.7558 12.7558 12.7558 ZT8-11 14.953949999999999 14.953949999999999 14.953949999999999 ZT12-15 28.80265 28.80265 28.80265 ZT16-19 31.617649999999998 31.617649999999998 31.617649999999998 ZT20-23 29.4708 29.4708 29.4708