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Table 2 The course of headache during pregnancy ('+' also contains those patients reporting decreased headaches after the 3rd month of pregnancy)

From: Impact of sex hormonal changes on tension-type headache and migraine: a cross-sectional population-based survey in 2,600 women

Headache type Improved + Worsened No change
Definite migraine 162 (57 %) 31 (11 %) 91 (32)
Probable migraine 52 (46 %) 15 (13.3 %) 46 (40.7 %)
Total migraine 214 (53.9 %)* 46 (11.6 %)** 137 (34.5 %)
Definite TTH 12 (34.3 %) 1 (2.9 %) 22 (62.9 %)
Probable TTH 26 (42.6 %) 3 (4.9 %) 32 (52.5 %)
Total TTH 38 (39.6 %) 4 (4.2 %) 54 (56.3 %)***
  1. Pearson Chi-square, Yates’ continuity correction and Fisher’s exact tests were used where appropriate
  2. * p < 0.001, compared to total TTH
  3. ** p = 0.036 compared to total TTH
  4. *** p < 0.001 compared to total migraine