For patients measured on more than one occasion, all data are given for the first measurement.
At least one twin in ˃97% of pairs in the sample consumed common family foods such as cereal products, dairy, bread, meat and fish, fruit, and vegetables on at least one occasion during data collection (Table 2), with a low consumption of commercial infant foods (7% of total daily energy in consumers) (Table 3).
A positive malaria slide was found on 37/583 (6%) occasions: 18 patients were positive on one occasion, five on two occasions and three on three occasions.
An endeavour was made to collect all data on one occasion, but in some cases new appointments had to be made to complete all stages of the procedure.
While not illustrated in table 2, a larger total budget leads to a wider occurrence of the optimal strategy being to collect data on one occasion per subject.
The determination of the boldface strategy in section a was illustrated in figure 4. As illustrated in table 2, the optimally cost-efficient strategy in many scenarios is to obtain data on one occasion from as many subjects as possible.
As illustrated by the numerical examples in table 2, a large ratio of between-subjects to within-subject variance generally implies that the optimal allocation principle is to collect data on one occasion from as many subjects as allowed by the budget.
Lung sounds were recorded in 120 infants on 144 test occasions, with 98 infants (82%) tested on one occasion, 20 (17%) on two occasions and 2 (1.7%) on three occasions.
Results: From July 1999 to December 2000, 620 patients underwent duplex scanning on one occasion, and 417 on two occasions.
The 1571 admissions were in 1303 patients, 1173 patients presented on one occasion and 130 on two or more occasions.
