Table 1.
Demographic information on the 188 subjects with third-trimester cytokine data from the schizophrenia (SCZ) case–control study stratified by sex
| Psychosis (SCZ and AP) |
Controls |
|||
|---|---|---|---|---|
| Males (n=53) | Females(n=35) | Males(n=48) | Females(n=52) | |
| Categorical variablesa, n (%) | ||||
| Ethnicity, mother | ||||
| Caucasian | 41 (77.4) | 28 (80.0) | 47 (97.9) | 46 (88.5) |
| African-American | 12 (22.6) | 7 (20.0) | 1 (2.1) | 4 (7.7) |
| Other | 0 (0.0) | 0 (0.0) | 0 (0.0) | 2 (3.8) |
| Socio-economic status of origin, quartile | ||||
| Lowest | 14 (26.4) | 7 (20.0) | 10 (20.8) | 10 (19.2) |
| Lower middle | 16 (30.2) | 5 (14.3) | 10 (20.8) | 18 (34.6) |
| Upper middle | 14 (26.4) | 10 (28.6) | 15 (31.3) | 9 (17.3) |
| Highest | 7 (13.2) | 13 (37.1) | 13 (27.1) | 12 (23.1) |
| Missing | 2 (3.8) | 0 (0.0) | 0 (0.0) | 3 (5.8) |
| Marital status, mother | ||||
| Single | 6 (11.3) | 2 (5.7) | 0 (0.0) | 1 (1.9) |
| Married | 47 (88.7) | 32 (91.4) | 47 (97.9) | 48 (92.3) |
| Divorced | 0 (0.0) | 0 (0.0) | 1 (2.1) | 2 (3.8) |
| Separated | 0 (0.0) | 1 (2.9) | 0 (0.0) | 1 (1.9) |
| Season of birth | ||||
| Winter (December–February) | 12 (22.6) | 8 (22.9) | 10 (20.8) | 13 (25.0) |
| Spring (March–May) | 14 (26.4) | 10 (28.6) | 17 (35.4) | 10 (19.2) |
| Summer(June–August) | 14 (26.4) | 8 (22.9) | 11 (22.9) | 15 (28.8) |
| Fall(September–November) | 13 (24.5) | 9 (25.7) | 10 (20.8) | 14 (26.9) |
| Study site | ||||
| Boston | 35 (66.0) | 26 (74.3) | 40 (83.3) | 38 (73.1) |
| Providence | 18 (34.0) | 9 (25.7) | 8 (16.7) | 14 (26.9) |
| Continuous variablesb, mean (s.d.) | ||||
| Maternal variables | ||||
| Age (years) | 26.0 (6.3) | 25.1 (5.5) | 25.3 (4.7) | 27.4 (6.7) |
| Education (years) | 10.5 (2.2) | 10.8 (2.0) | 11.3 (2.4) | 11.4 (2.6) |
| Offspring variables | ||||
| Year of birth | 1962.2 (1.9) | 1963.0 (1.9) | 1962.7 (1.8) | 1962.8 (2.0) |
AP, Affective psychoses; s.d., standard deviation.
a
Cases versus controls (categorical variables). Compared with male controls, among male SCZ cases there were more African-Americans(, p=0.002),single mothers(, p=0.03) and participants from Providence (, p<0.05). Among the categorical variables, there were no differences between female cases and controls.
b
Cases versus controls (continuous/count variables): there were no significant differences between cases and controls by sex among the continuous variables.