Table 2. Summary data for yield (hl/ha) and must sugar content (°Oe).
| Yield (hl/ha) | n | Mean | SD | Min | Max | b | R2 | p |
| Period 1 (1805–1914) | 103 | 12.8 | 7.5 | 0.0 | 32.5 | 0.03 | 0.02 | 0.160 |
| Period 2 (1915–1952) | 35 | 30.2 | 15.3 | 5.1 | 46.0 | 0.59 | 0.17 | 0.012 |
| Period 3 (1962–2010) | 47 | 49.3 | 14.3 | 21.7 | 98.5 | 0.45 | 0.19 | 0.002 |
| Mean must sugar content (°Oe) | ||||||||
| Period 1S (1864–1905) | 42 | 87.6 | 7.8 | 75.5 | 108.5 | 0.09 | 0.02 | 0.377 |
| Period 3S (1962–2010) | 49 | 92.6 | 20.6 | 56.5 | 157.5 | 0.83 | 0.33 | <0.001 |
| Overall trend yield (hl/ha) | ||||||||
| Period 1–3 (1805–2010) | 185 | 25.4 | 19.0 | 0.0 | 98.5 | 0.25 | 0.61 | <0.001 |
| Overall trend must sugar content (°Oe) | ||||||||
| Period 1S & 3S (1864–1905, 1962–2010) | 91 | 90.4 | 16.1 | 56.5 | 157.5 | 0.33 | 0.17 | <0.001 |
Data is presented separately for the three periods and for the entire study period. Trends through time are summarized in the final three columns from regressions of the variable on year. b = slope of the regression coefficient. Results in bold are significant (p<0.05).