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Table 3
Summary of epidemiological studies on the occupational risk of reproductive disorders among hairdressers
Outcome	Statistically significant	Non- significant*	No association	Reference

Infertility	+			Baste [33]
			±	Hougaard [36]

Subfertility		+		Ronda [30]
Time to pregnancy		+		Kersemaekers [25]

Menstrual disorders^§	+			Blatter [23]
		+		Ronda [30]

Premature ovarian failure		+		Gallicchio [34]

Spontaneous abortion	1st period +		2nd period ±	Kersemaekers [25]
			±	Zhu [28]
			±	Ronda [31]
			±	Axmon [32]
	+			Baste [33]

Preterm birth			±	Rylander [27]
			±	Zhu [28]
			±	Ronda [31]
	+			Halliday-Bell [38]

Stillbirth	-			Goulet [16]
			±	Zhu [28]

Perinatal death	+			Halliday-Bell [38]

Small for gestational age	+			Rylander [27]
	+			Rylander [35]
			±	Zhu [28]
			±	Ronda [31]
			±	Axmon [37]
	+			Halliday-Bell [38]

Large for gestational age	-			Axmon [37]

Low birth weight		+		Kersemaekers [25]
	+			Rylander [27]
			±	Rylander [35]
			±	Axmon [37]
	+			Halliday-Bell [38]

Congenital malformation^§		+		Bianchi [12]
	+			Rylander [27]
			±	Zhu [28]
Hypospadias				Vrijheid [14]
		+		Ormond [21]
Orofacial cleft		+		Bianchi [12]
		+		Nguyen [20]
Cleft palate				Lorente [13]
Cleft lip		+		Lorente [13]
			±


	+

Cancer
Kidney cancer	Father +		Mother ±	Mutanen [22]
Astrocytoma		+		Kuijten [17]
Neuroblastoma	Mother +	Father +		Olshan [19]
Brain tumour			±	Cordier [18]

Delayed child	1st period +		2nd period ±	Kersemaekers [26]
development			±	Zhu [28]

+ Positive association - Negative association ± No association * Risk estimation ≥ 1.5 or ≤ 0.5 § [15,29] not included because no effect estimate was given
Peters et al. Journal of Occupational Medicine and Toxicology 2010 5:24 doi:10.1186/1745-6673-5-24

Table 3