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Table 3 Silica gel sachets inspected in RDTs: type, presence of indicator and saturation

From: Assessment of desiccants and their instructions for use in rapid diagnostic tests

Number of sachets assessed % saturated* (95% CI) % without indicator (95% CI)
Self-indicating silica gel
1 625 0.0  
2 1,933 0.05 (0.01 - 2.88)  
3 190 0.0  
4 223 0.0  
5 550 0.0  
6 484 1.2 (0.46 - 2.68)  
7 566 4.6 (3.02 - 6.66)  
Partial-indicating silica gel
1 1,507 0.3 (0.08 - 0.75) 9.5 (8.06 - 11.08)
2 2,160 0.1 (0.13 - 0.39) 13.5 (12.06 - 14.99)
3 384 2.5 (1.09 - 4.87) 16.7 (13.08 - 20.78)
4 672 0.2 (0.00 - 0.94) 12.5 (10.09 - 15.24)
5 2,066 0.0 14.6 (13.08 - 16.17)
6 483 0.0 17.8 (14.50 - 21.52)
7 1,721 3.6 (2.75 - 4.68) 10.2 (8.84 - 11.76)
8 483 0.0 0.6 (0.13 - 1.80)
9 146 0.0 6.8 (3.33 - 12.24)
  1. * % saturated: proportion (%) of sachets with humidity indicator that indicated saturation.
  2. % without indicator: proportion (%) of partial-indicating silica gel sachets in which no indicator (coloured) beads were observed.
  3. The number of partial-indicating silica gel sachets exceeds that of table 2 because from one RDT product two lots with different desiccant types, including partial-indicating silica gel, were available.