condition mean min max ZT0-3 1061.497705 1061.497705 1061.497705 ZT4-7 729.4865225000001 729.4865225000001 729.4865225000001 ZT8-11 707.785406 707.785406 707.785406 ZT12-15 870.753477 870.753477 870.753477 ZT16-19 1181.121149 1181.121149 1181.121149 ZT20-23 1044.2353935 1044.2353935 1044.2353935