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Table 1 Mean and 95% confidence interval of primary outcome Haemoglobin (Hb), and secondary outcomes Haematocrit (Ht) and Body weight on day 26 of age per treatment group and estimated difference with 95% confidence intervals (95% CI) between Needle and Needle-Free treatment with Control group.

From: Comparison of efficacy of needle-free injection versus injection by needle for iron supplementation of piglets: a double blind randomized controlled trial

Study group

Mean

95% CI

Estimated difference

95% CI

Lower limit

Upper limit

Lower limit

Upper limit

Hb (mmol/L)

      

 Control

5.89

5.43

6.36

Refa

  

 Needle

7.33

7.17

7.47

1.43

1.06

1.81

 Needle-free

7.28

7.00

7.55

1.38

1.01

1.75

Ht (vol%)

      

 Control

0.32

0.30

0.34

Refa

  

 Needle

0.38

0.37

0.39

0.06

0.04

0.08

 Needle-free

0.37

0.36

0.39

0.05

0.03

0.07

Body weight (kg)

      

 Control (C)

7.86

7.13

8.58

Refa

  

 Needle (N)

7.92

7.41

8.42

0.06

 − 0.58

0.71

 Needle-free (NF)

7.54

7.00

8.08

 − 0.33

 − 0.98

0.32

  1. Iron supplement was administered at day 3
  2. aReference for comparison with other treatments