condition mean min max ZT0-3 1.14519 1.14519 1.14519 ZT4-7 0.5830275 0.5830275 0.5830275 ZT8-11 1.4414 1.4414 1.4414 ZT12-15 1.894305 1.894305 1.894305 ZT16-19 1.40123 1.40123 1.40123 ZT20-23 1.2262445 1.2262445 1.2262445