condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 11.47297 11.47297 11.47297 ZT8-11 11.355260000000001 11.355260000000001 11.355260000000001 ZT12-15 10.7380075 10.7380075 10.7380075 ZT16-19 12.20275 12.20275 12.20275 ZT20-23 12.389047 12.389047 12.389047