condition mean min max ZT0-3 16.17655 16.17655 16.17655 ZT4-7 11.2939 11.2939 11.2939 ZT8-11 17.042949999999998 17.042949999999998 17.042949999999998 ZT12-15 13.6619 13.6619 13.6619 ZT16-19 11.057400000000001 11.057400000000001 11.057400000000001 ZT20-23 13.0994 13.0994 13.0994