Table 1.
Summary of experimental design variables and median lifespans by decade for all control groups of survivorship cage trials conducted in the US from 1970 to 2019.
| Decade | Population | Water | Pollen | Pollen substitute | Median lifespan | |||
|---|---|---|---|---|---|---|---|---|
| n | Mean (SE) | Median | Range | n | n | n | Mean (SE) | |
| 1970 | 42 | 68.57 (5.91) | 75 | 10–170 | 34 | 25 | 23 | 34.30 (1.51) |
| 1980 | 8 | 50 (5.67) | 60 | 20–60 | 7 | 2 | 1 | 29.71 (4.67) |
| 1990 | 4 | 77.5 (22.5) | 100 | 10–100 | 3 | 3 | 1 | 19.15 (3.56) |
| 2000 | 2 | 38 (22) | 38 | 16–60 | 1 | 1 | 0 | 25.38 (6.62) |
| 2010 | 12 | 38.33 (4) | 35 | 20–60 | 5 | 6 | 1 | 17.67 (2.02) |