Table 2

Contingency table of day-to-day change of mean atmospheric pressure (ΔP)

Quintiles of ΔP
Days



0 Events
1 Event

1 (ΔP < -2.5 hPa)
349
16
2 (-2.5 hPa ≤ ΔP < -0.7 hPa)
346
19
3 (-0.7 hPa ≤ ΔP < 0.7 hPa)
351
14
4 (0.7 hPa ≤ ΔP < 2.5 hPa)
352
13
5 (ΔP ≥ 2.5 hPa)
345
20

Danielides et al. BMC Ear, Nose and Throat Disorders 2002 2:2   doi:10.1186/1472-6815-2-2