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Table 2 Volume of buffer (μl) contained in pre-packaged vials (10 vials per lot tested)

From: Quality issues with malaria rapid diagnostic test accessories and buffer packaging: findings from a 5-country private sector project in Africa

Test lot #

Specified volume

Acceptable deviation (μl)

Mean volume

SD

Min–max

Mean volume falls within acceptable deviation?

% variation

1 (Uganda)

70

±10

53.17

18.07

17.78–77.44

No

−24.0%

1 (Nigeria

70

±10

43.32

15.77

21.15–66.88

No

−38.1%

2

130

±39

110.02

9.48

93.48–120.44

Yes

−15.4%

3 (Uganda)

130

±39

109.08

5.48

101.18–118.35

Yes

−16.1

3 (Nigeria)

130

±39

113.06

4.25

107.91–121.07

Yes

−13.0%

4

130

±39

112.12

8.05

95.91–123.11

Yes

−13.8%

5

130

±39

111.34

5.55

103.67–121.53

Yes

−14.4%

6

130

±39

116.13

4.65

108.91–123.98

Yes

−10.7%

  1. Lots 1 and 3 sampled from Uganda and Nigeria; all other lots sampled from Nigeria only. % variation is based on the difference between the manufacturer’s specified volume in column 2 and the mean volume in column 4