Season of birth (SOB) has been associated with such diverse physiological and psychological human traits as birth weight [1], adult height [2], [3], body-mass index (BMI = weight in kg/height in m2) [4], [5], eating disorders [6], blood pressure [7], life expectancy [8], handedness [9], age of menarche [10], fecundability [11], sex-ratio of offspring [12], age at menopause [10], suicide[13]–[16], schizophrenia [17], [18], autism [19], panic disorder [20], university grades [21] and morning versus evening preference [22]–[24]. Of particular interest for our study, winter-borns exhibit increased novelty seeking [25]–[27] and sensation seeking [28] relative to those born during the remainder of the year.
