condition mean min max ZT0-3 10.139281 10.139281 10.139281 ZT4-7 10.682838499999999 10.682838499999999 10.682838499999999 ZT8-11 10.5570345 10.5570345 10.5570345 ZT12-15 10.6898265 10.6898265 10.6898265 ZT16-19 11.20645 11.20645 11.20645 ZT20-23 10.8761865 10.8761865 10.8761865