Longer v shorter needle for giving routine immunisations to infants*

OutcomesLonger needleShorter needleRRR (95% CI)NNT (CI)
*Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.
Any local reaction up to 3 days62%84%26% (7 to 43)5 (3 to 19)
Redness at 6 hours40%60%34% (3 to 56)5 (3 to 81)
At 1 day28%63%55% (30 to 73)3 (2 to 7)
At 2 days 9%39%76% (43 to 90)4 (3 to 8)
At 3 days 4%28%87% (51 to 96)5 (3 to 9)
Swelling at 6 hours23%58%61% (35 to 78)3 (2 to 6)
At 1 day28%63%55% (30 to 73)3 (2 to 7)
At 2 days19%51%63% (34 to 80)4 (3 to 7)
At 3 days13%40%67% (33 to 85)4 (3 to 10)