Mean number of ATI consultations and mean differences (with 95% CIs) comparing 3-year time intervals (1998–2001, 2002–2004 and 2005–2007) | ||||||||
---|---|---|---|---|---|---|---|---|
n | 1998–2001 3 years prior to index | 2002–2004 1–3 years postindex | Mean difference between 1998–2001 and 2002–2004† | n | 1998–2001 3 years prior to index | 2005–2007 4–6 years postindex | Mean difference between 1998–2001 and 2005–2007† | |
3 years prior to index date and 1–3 years' follow-up | 3 years prior to index date and 4–6 years' follow-up | |||||||
All children | ||||||||
No tonsillectomy | 12 053 | 0.44 | 2.25 | +1.81 (1.78 to 1.84) *** | 10 593 | 0.44 | 0.93 | +0.49 (0.46 to 0.52)*** |
Tonsillectomy | 414 | 1.31 | 0.66 | −0.65 (−0.78 to −0.51)*** | 358 | 1.32 | 0.6 | −0.72 (−0.88 to −0.56)*** |
Girls 4–7 years | ||||||||
No tonsillectomy | 2375 | 0.7 | 2.43 | +1.74 (1.66 to 1.81)*** | 2092 | 0.7 | 1.04 | +0.35 (0.27 to 0.42)*** |
Tonsillectomy | 78 | 1.32 | 0.76 | −0.56 (−0.94 to −0.19)** | 71 | 1.34 | 0.65 | −0.69 (−1.08 to −0.31)*** |
Boys 4–7 years | ||||||||
No tonsillectomy | 2242 | 0.7 | 2.29 | +1.59 (1.51 to 1.67)*** | 1989 | 0.69 | 0.76 | +0.06 (0.00 to 0.13) |
Tonsillectomy | 110 | 1.32 | 0.83 | −0.49 (−0.81 to −0.18)** | 92 | 1.32 | 0.55 | −0.76 (−1.02 to −0.50)*** |
Girls 8–11 years | ||||||||
No tonsillectomy | 1944 | 0.35 | 2.23 | +1.87 (1.80 to 1.95)*** | 1744 | 0.35 | 1.08 | +0.73 (0.65 to 0.81)*** |
Tonsillectomy | 71 | 1.43 | 0.73 | −0.70 (−0.99 to −0.42)*** | 65 | 1.43 | 0.92 | −0.51 (−1.00 to −0.01)* |
Boys 8–11 years | ||||||||
No tonsillectomy | 1526 | 0.31 | 2.04 | +1.73 (1.65 to 1.80)*** | 1395 | 0.31 | 0.71 | +0.40 (0.33 to 0.47)*** |
Tonsillectomy | 59 | 1.17 | 0.34 | −0.83 (−1.16 to −0.51)*** | 49 | 1.22 | 0.39 | −0.84 (−1.23 to −0.45)*** |
Girls 12–15 years | ||||||||
No tonsillectomy | 2206 | 0.23 | 2.45 | +2.22 (2.14 to 2.30)*** | 1866 | 0.23 | 1.2 | +0.97 (0.89 to 1.04)*** |
Tonsillectomy | 66 | 1.29 | 0.62 | −0.67 (−0.95 to −0.38)*** | 55 | 1.22 | 0.62 | −0.60 (−0.96 to −0.24)** |
Boys 12–15 years | ||||||||
No tonsillectomy | 1760 | 0.2 | 1.91 | +1.70 (1.64 to 1.77)*** | 1507 | 0.21 | 0.68 | +0.47 (0.41 to 0.53)*** |
Tonsillectomy | 30 | 1.27 | 0.37 | −0.90 (−1.28 to −0.52)*** | 26 | 1.42 | 0.23 | −1.19 (−1.69 to −0.69)*** |
*p<0.05.
**p<0.01.
***p<0.001.
†Paired t test.