The total solids levels in the 16 test materials are reported in Table 2. By using analysis of variance, the levels of total solids derived from the three methods of analysis were not significantly different (p > 0.05). However, since hot air oven is a basic instrument for all laboratories, it is cheaper and easier to operate and calibrate than a vacuum oven, and as drying at 102 °C is the general principle for moisture determination in foods, the method of drying in hot air oven at 102 °C was chosen as the candidate method for further collaborative study