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Table 1 Features of the studies included in this paper. Abbreviations: ICHD – International Classification of Headache Disease, second and third versions; IHS – International Headache Society; TTH – tension-type headache

From: Relationship between alcohol and primary headaches: a systematic review and meta-analysis

No

Author

Country

Criteria to diagnose headache

Type of headache

Drinkers

Non-drinkers

Overall number of headache patients

Control group

Drinkers

Non-drinkers

Overall number of control patients

Methods used to assessment drinking

Criteria to recognize habits for alcohol consumption

1.

Lisicki M et al. [44]

International

ICHD-3

Migraine

20

39

59

Non-headache

30

47

77

Self-designed questionnaire

Frequency divided on: never, ≥ once a month, ≥ once a week and every day for wine, beer and other alcoholic beverages

2.

Schramm S et al. [45]

Germany

ICHD not reported the edition

Migraine

49

367

416

Non-headache

96

367

463

Questionnaire

Alcohol was assessed as the average consumption of different beverages (beer, red wine, white wine, spirits, and cocktails) within the last 4 weeks. The proportion of pure alcohol per beverage was calculated multiply by frequency of drinking. All beverages drinked by each person were summed up and presented as the total consumption of pure alcohol g/day

3.

Aamodt AH et al. [46]

Norway

IHS from 1988

Migraine

4012

2197

6209

Non-headache

30,421

14,749

45,170

Questionnaire

Abstinence, number of times per month and the number of glasses of beer, wine or liquor during the last 2 weeks

4.

Hagen K et al. [36]

Norway

ICHD-2

Migraine

24

65

89

Non-headache

967

1086

2053

Self-designed questionnaire

The participants were divided into four groups: no use, less than four times per month, four to seven times per month, or at least eight times per month

Tension type headache

749

52

801

Non-headache

11,680

1086

12,766

5.

Misakian AL et al. [47]

International

Modified

version of the IHS

Migraine

149

922

1071

Non-headache

1717

6839

8556

Self-designed questionnaire

Alcohol use was divided into 4 groups: never/rarely, 1–3 times/month, 1–6 times/week, daily

6.

Luo J [48]

United States of America

ICHD-3

Migraine

51

458

509

Non-headache

359

2278

2637

Questionnaire

Alcohol was divided into 2 groups: alcohol drinker (had any alcohol in the last 24 h) or non-drinker (lack of alcohol within last 24 h)

7.

Özcan RK et al. [49]

Turkey

ICHD-3 beta

Migraine

1

141

142

Non-headache

1

141

142

Questionnaire

Alcohol use was defined by identifying the quantity consumed in the last month

8.

Sarker MA et al. [50]

Bangladesh

IHS-2

Migraine

19

119

138

Non-headache

4

272

276

Questionnaire

The patients were asked about consuming any alcoholic drink in the last 2 weeks

9.

Le H et al. [51]

Denmark

IHS

Migraine

5744

2200

7944

Non-headache

19,073

4431

23,504

Questionnaire

Alcohol consumption was divided into 3 groups: never/seldom, monthly, weekly

10.

Schramm SH et al. [52]

Germany

ICHD-2

Migraine

2

722

724

Non-headache

6

1068

1074

Questionnaire

2 groups were distinguished: drinking (yes) was defined as daily or almost daily drinking of alcoholic beverages and drinking (no) was defined as no or casual drinking of alcoholic beverages

Tension type headache

11

1544

1555

6

1023

1029

11.

Kim BS et al. [53]

Korea

ICHD-3

Migraine

3

48

51

Non-headache

23

79

102

Questionnaire + interview

Alcohol drinking was positive if regular drinking were once a week

12.

Gür-Özmen S et al. [54]

Turkey

ICHD-2

Migraine

4

166

170

Non-headache

1

169

170

Questionnaire

The mean daily alcohol intake was calculated using the beverage-specific quantity-frequency measure: number of days with alcohol consumption (beer, wine, and spirits)mean daily alcohol consumption over the past week. Amount of wine and beer in liters and spirits in glasses was assessed and calculated in grams per day

Tension type headache

0

170

170

1

169

170

13.

Yoon MS et al. [55]

Germany

ICHD-2

Migraine

320

4244

4564

Non-headache

555

3086

3641

Questionnaire

Alcohol was assessed by drinking daily and not daily alcohol consumption

Tension type headache

126

1107

1233

555

3086

3641

14.

Kaltseis K et al. [26]

International

ICHD-3

Migraine

154

31

185

Non-headache

729

222

951

Interview

Alcohol intake was divided into 2 groups: drinkers and non-drinkers. Drinkers positively answer the question whether drinked alcohol last week and disclose the type, amount, and frequency of the consumed beverages. Then, the alcohol consumption was calculated using the formula: amount of alcohol beverage in milliliters Vol% 100 0:8 ¼ alcohol in grams:

Tension type headache

479

78

557

729

222

951

15.

Pellegrino Baena C et al. [56]

Brasil

IHS

Migraine

179

1060

1239

Non-headache

1096

131

1227

Questionnaire

Alcohol use was defined as never, former or present. Whereby never was assumed as non-drinkers, the rest of participants (former, present) were assumed as drinkers

16.

McMurtray AM et al. [57]

United States of America

ICHD-2

Migraine

2

22

24

Non-headache

7

7

14

Questionnaire

Alcohol use was defined as none, past or current. Whereby none was assumed as non-drinkers, the rest of participants (past, current) were assumed as drinkers

Tension type headache

2

19

21

Non-headache

7

7

14

17.

Lebedeva ER et al. [27]

International

ICHD-3

Migraine

129

367

496

Non-headache

282

732

1014

Interview

Alcohol intake was divided into consumption of light alcoholic beverages (at least 0.5 L per week) and strong alcoholic beverages (150 g per week)

Tension type headache

639

1196

1835

Non-headache

282

732

1014

18.

Schramm SH et al. [58]

German

ICHD-2

Migraine

114

1564

1678

Non-headache

555

3086

3641

Questionnaire

Alcohol was assessed by drinking daily and not daily alcohol consumption

Tension type headache

11

1587

1598

555

3086

3641

19.

Scher AI et al. [59]

Netherland

IHS

Migraine

304

316

620

Non-headache

3235

1900

5135

Questionnaire

Alcohol consumption was

categorized as 0, < 1, 1 to 3 and + 4 drinks per day

20.

Rasmussen BK [60]

Denmark

IHS

Tension type headache

53

114

167

Non-tension type headache (migraine)

38

81

119

Interview

Alcohol intake was recorded as number of drinks (beers. glasses of wine. and glasses of strong alcohol) per week (1 drink = 10 g of alcohol)

21.

Lund N et al. [61]

Denmark

ICHD-2

Cluster headache

242

157

397

Non-headache

179

21

200

Questionnaire + interview

Alcohol intake was positive if participants had reported any intake of alcohol per week during the past year

22.

Lambru G et al. [62]

Italy

ICHD-2

Cluster headache

149

51

200

Non-cluster headache (migraine)

113

87

200

Questionnaire

Alcohol consumption, measured in alcohol units per day and if there was positive intake the division on: mild drinkers, < 4 units/day; moderate drinkers, 4–8 units/day; heavy drinkers, > 8 units/day was conducted