Table 1.
Characteristics of influenza immunizations between July 1, 2007 and March 31, 2014 for children 2–18 years of age with a history of asthma prior to the immunization, Kaiser Permanente Northern California.
| Characteristica | Immunization Typec | ||
|---|---|---|---|
| All | IIV | LAIV | |
| Number of unique children | 154,994 | 143,013 | 35,624 |
| Number of immunizations | 387,633 | 330,807 | 56,826 |
| Gender, n (%) | |||
| Female | 168,298 (43) | 142,409 (43) | 25,889 (46) |
| Male | 219,335 (57) | 188,398 (57) | 30,937 (54) |
| Age (years) at immunization, mean (median) | 10.59 (10.77) | 10.63 (10.87) | 10.36 (10.28) |
| Age group (years), n (%) | |||
| 2 | 11,735 (3) | 10,824 (3) | 911 (2) |
| 3–4 | 38,119 (10) | 33,046 (10) | 5073 (9) |
| 5–7 | 71,212 (18) | 59,201 (18) | 12,011 (21) |
| 8–10 | 78,881 (20) | 65,345 (20) | 13,536 (24) |
| 11–14 | 110,105 (28) | 94,061 (28) | 16,044 (28) |
| 15+ | 77,581 (20) | 68,330 (21) | 9251 (16) |
| Asthma type | |||
| Current or recent, persistent | 170,083 (44) | 156,044 (47) | 14,039 (25) |
| Current or recent, not persistent | 108,725 (28) | 92,565 (28) | 16,160 (28) |
| Remote history of asthma only | 108,825 (28) | 82,198 (25) | 26,627 (47) |
| Season of immunizationb | |||
| 2007 | 39,459 (10) | 36,300 (11) | 3159 (6) |
| 2008 | 43,668 (11) | 36,218 (11) | 7450 (13) |
| 2009 | 56,064 (14) | 48,324 (15) | 7740 (14) |
| 2010 | 52,976 (14) | 44,648 (13) | 8328 (15) |
| 2011 | 57,456 (15) | 47,209 (14) | 10,247 (18) |
| 2012 | 65,384 (17) | 54,077 (16) | 11,307 (20) |
| 2013 | 72,626 (19) | 64,031 (19) | 8595 (15) |
a
For every characteristic, differences between IIV and LAIV children were significant at p ≥ 0.01.
b
“Season” is defined as running from July 1st of the year listed to June 30th of the following year.
c
IIV: inactivated influenza vaccine; LAIV: live attenuated influenza vaccine.