Table 2.
Trend changes in the relative search volumes of ulcerative colitis in 2016-2020.a
| Country, year | Period 1 | Period 2 | Period 3 | |||
| Weeks | Weekly percentage change (%) (95% CI) | Weeks | Weekly percentage change (%) (95% CI) | Weeks | Weekly percentage change (%) (95% CI) | |
| United States, 2016 | 1-3 | 80.2b (40.1 to 131.8) | 3-6 | –19.5 (–37.4 to 3.6) | 6-52 | –0.2b (–0.4 to 0) |
| United States, 2017 | 1-53 | 0.2 (0 to 0.4) | N/Ac | N/A | N/A | N/A |
| United States, 2018 | 1-52 | 0.1 (–0.1 to 0.3) | N/A | N/A | N/A | N/A |
| United States, 2019 | 1-52 | –0.3b (–0.4 to –0.1) | N/A | N/A | N/A | N/A |
| United States, 2020 | 1-16 | –2.8b (–4.0 to –1.6) | 16-24 | 3.7 (–0.3 to 7.8) | 24-52 | –0.5 (–0.9 to 0) |
| Worldwide, 2016 | 1-52 | –0.3b (–0.6 to –0.1) | N/A | N/A | N/A | N/A |
| Worldwide, 2017 | 1-46 | 0.1 (0 to 0.2) | 46-49 | 5.7 (–6.5 to 19.6) | 49-53 | –7.9b (–11.5 to –4.3) |
| Worldwide, 2018 | 1-52 | 0 (–0.1 to 0.1) | N/A | N/A | N/A | N/A |
| Worldwide, 2019 | 1-46 | 0 (–0.1 to 0.1) | 46-52 | –2.1 (–4.5 to 0.3) | N/A | N/A |
| Worldwide, 2020 | 1-52 | 0 (–0.4 to 0.3) | N/A | N/A | N/A | N/A |
aPeriods were separated as Period 1-4, when the trend changes were statistically detected in the joinpoint regression analysis during the study period.
bSignificantly different from zero (P<.05).
cN/A: not applicable.