condition mean min max ZT0-3 8.702277500000001 8.45135 8.953205 ZT4-7 10.480385 10.480385 10.480385 ZT8-11 15.88015 15.88015 15.88015 ZT12-15 0 0 0 ZT16-19 13.88925 13.88925 13.88925 ZT20-23 11.70625 11.70625 11.70625