Written by Women accounted for most of the noise is a major textile enterprises occupational hazards. Noise on hearing damage has been recognized by the world, many scholars also believe that the noise on the womens menstruation, pregnancy and others have adverse effects on the process, but still inconclusive. Therefore, one of the issues that people pay attention.
1 Materials and Methods
1.1 General information on investigations in the city have worked in a textile mill more than 1 year, aged 18-45 years old women without chronic diseases. Plant noise are stationary noise. Noise intensity by exposure group, divided into noise group (> 85 dB) 578 people in the control group (68 dB) 233 people, the noise in the noise group was divided into groups (average 87 dB) 280 people, high noise group (mean 96 dB) 298 people. Personal lives of workers in each group hobbies, marital status, contraceptive measures, etc. are basically the same, their spouses were not exposed to harmful chemicals. A total of 811 people. Requirements by matching pairs, the noise group of 156 people, including middle and high noise group 78. Control group of 78 people.
1.2 Methods
Individual asked, one by one method of filling investigated their menstrual status during pregnancy, childbirth cases, the childs birth circumstances, contraception and life habits (tobacco, alcohol) and so on. According to their exposure to noise analysis of the case group. By age, age at menarche, length of service are the standard difference of 1 year to life habits, contraceptive measures exactly the premise of women in the survey to do paired research.
1.3 Statistical analysis Data were analyzed using Excel 2003 for processing, chi-square test using PEMS3.1.
2 Results
2.1 pairs of menstruation
2.1.1 premenstrual tension syndrome in
Noise group the incidence of premenstrual tension syndrome was 45.8%, while the control group was 46.78%, the difference was not significant (X2 = 0.06, P> 0.05). High, the noise group were higher. But not statistically significant. Paired study found that noise group incidence of premenstrual tension syndrome, 51.28%, 46.15% of the control group. The difference is not statistically significant (x2 = 0.55, p> 0.05), high, higher than the noise group also. But compared with the control group were statistically significant differences were not found.
2.1.2 Influence of the menstrual function of the noise group, menstruation, menorrhagia, irregular periods higher incidence, but only the incidence of menorrhagia (31.83%) than control group (21.46%) (x2 = 8.71, P <0.01). Extended period of high noise group, menstrual cycle abnormalities, the incidence of menorrhagia (19.46%, 24.16%. 36.58%) than the control group (12.88%, 16.31%, 21.46%) high. Differences were statistically significant (x2, respectively: x2 = 4.10, P <0.05; x2 = 4.91, P <0.05; X2 = 7.58, P <0.05). Paired study found that noise group were higher than the targets, which the menstrual cycle abnormalities (23.72%) than the control group (11.54%) high (x2 = 4.88, P <0.05), and the high group and the control of noise group difference was also statistically significant (x2 = 6.80. P <0.01; X2 = 4.73, P <0.05). A higher incidence of menstruation. Noise group (25.64%), high noise group (29.49%), 21.79% in the noise group and the control group (10.26%) were significantly (x2 = 11.57, P <0.01; x216.49, P <0.01; x2 = 4.36, P <0.05).
2.2 The process of pregnancy and pregnancy outcome
During pregnancy also have an impact of noise on. Most of the indicators investigated the incidence increases with the noise level the tendency. Reaction pregnancy , pregnancy hypertension, dystocia , caesarean section, miscarriage , premature birth , stillbirth rate higher than the incidence. One pregnancy hypertension increased significantly (x2 = 7.53. P <0.01), the incidence of high noise group was 13.04%, the difference was statistically significant (x2 = 5.02, P <0.05), the incidence of noise group 18.42% The difference was statistically significant (x2 = 9.74, P <0.05). Noise group of severe pregnancy hypertension incidence was 7.16%, significantly higher than the 1.72% (X2 = 9.16, P <0.01). Paired study also found that pregnancy hypertension, pregnancy reaction, dystocia, caesarean section, abortion, the higher incidence, although no significant difference found, but the increase in noise intensity can be seen with the increased incidence trend.
2.3 pairs of offspring
Noise group the incidence of low birth weight (4.05%) and milk secretion is too small (53.89%) slightly higher than the control rate, the average birth weight (3110 g) is slightly lower, not statistically significant, the noise team found one case of ectopic pregnancy , 2 cases of congenital malformations. The control group was not found. Paired study also found that low birth weight, milk production increased incidence is too small. Slightly lower average birth weight, the difference was not statistically significant. Paired research team found that one case of noise children with congenital malformations, while the control group were not found.
