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SummaryMedical records from maternity clinics in three Norwegian cities, Oslo, Bergen and Trondheim, have been used to study the relationship between lactation and post-partum amenorrhoea during the period 1860–1964. Resumption of menses after a period of post-partum amenorrhoea has been examined separately during lactation, after cessation of lactation, and in the absence of lactation, in 5250 cases. During ongoing lactation the median duration of post-partum amenorrhoea was found by survival analysis to be 12 months for women who had given birth before 1900 and 6 months for women who had given birth after 1900. In a Cox regression analysis, age of menarche and parity were found to influence the duration of post-partum amenorrhoea, in addition to the child's birth year. With a later age of menarche there was longer amenorrhoea, and primiparae resumed menses earlier than multiparae. After cessation of breast-feeding the median duration of amenorrhoea was 1 month, the only variable significantly influencing it being the age of menarche, a younger age showing a shorter duration. In the absence of lactation the survivor function started to decline after 3–4 weeks, and had a half-life of 2 months.None of the variables indicating the woman's social condition seemed to influence the duration of amenorrhoea. The decline in the duration of post-partum amenorrhoea during ongoing lactation from 1860 until today is therefore probably caused by a changed breast-feeding pattern rather than by improved nutrition for women giving birth.

SummaryData from birth records with information on previously born children from three maternity hospitals in Norway have been used to study the trend in breast-feeding practice from 1860 to 1984. During the whole period, the percentage of women breast-feeding for at least 1 week was remarkably high, above 90%. The results show a fairly stable duration of breast-feeding up until 1920, at least 3 months in approximately 80% of the women. After that year, the distribution of the duration of breast-feeding changed dramatically. The shortest durations were found in the late 1960s, when only about 30% lactated for 3 months or more. The duration then increased quickly, so that at the beginning of the 1980s about 80% of the women were again breast-feeding for at least 3 months.By multiple regression methods, the relationships of several independent variables to the duration of breast-feeding were investigated. Married women lactated for 1·5–3 months longer than unmarried, the difference being largest before 1920. First-born children were breast-fed for a little shorter time than second and later-born children. Until World War II women of lowest social strata had the longest durations of breast-feeding, and then the situation was reversed, women of highest social strata continuing the longest.

What is the state of gender equality in science and technology? Gender Equality in Academia – from Knowledge to Change presents the results of a comprehensive research project and program of initiatives at the University of Oslo's Faculty of Mathematics and Natural Sciences. Researchers have examined gender equality within the department, looking at reasons for imbalance, and at what occurs when measures to promote equality are implemented.

The book opens with an in-depth study of careers, gender issues and gender balance within academia. The study, based on questionnaires, interviews and follow-up evaluation, provides a new and updated understanding of the daily lives of academics in Norway. Among the topics covered are perceptions of equality and gender balance, effects of male dominance, sexual harassment, gender with respect to publishing, and the relationship between gender and diversity.

In addition to presenting new empirical data, the book is also an innovative contribution to theoretical development within gender equality research. In the second part of the book, the authors present three working models that elucidate current mechanisms recreating gender imbalance, and challenges for gender equality. The book's final part consists of analyses of measures taken to increase gender equality within the department and their effects, and what an organization can do to increase gender equality.

The range of topics in this book make it relevant for everyone concerned with gender equality in research and higher education. Researchers, administrators, students, other practitioners, and politicians will all find this book of interest. - Hvordan står det til med likestillingen innenfor realfag og teknologi? Likestilling i akademia – fra kunnskap til endring presenterer resultatene fra et omfattende forsknings- og tiltaksprosjekt ved Det matematisk-naturvitenskapelige fakultet ved Universitetet i Oslo. Forskerne har undersøkt likestillingssituasjonen ved fakultetet, sett på årsaker til ulikestilling, og på hva som skjer når man iverksetter tiltak for å fremme likestilling.

Boka innleder med en dybdestudie av karriere, kjønn og likestilling i akademia. Studien, som er basert på både spørreundersøkelser, intervjuer og følgeforskning, gir ny og oppdatert kunnskap om forskerhverdagen i norsk akademia. Blant temaene som belyses er syn på likestilling og kjønnsbalanse, effekter av mannsdominans, seksuell trakassering, kjønn og publisering, og hvordan kjønn og mangfold henger sammen.

I tillegg til å presentere ny empiri utgjør boka også et nyskapende bidrag til teoriutvikling innen likestillingsforskningen. I bokas del 2 presenterer forfatterne tre arbeidsmodeller som belyser aktuelle mekanismer og utfordringer i likestillingsarbeidet. Deretter trekkes linjen videre til arbeidet for å fremme likestilling. I siste del analyseres tiltakene som ble iverksatt for å øke likestillingen ved fakultetet, hvilke effekter de hadde, og hva en organisasjon kan gjøre for å øke likestillingen. Bredden i boka gjør den relevant for alle som er opptatt av likestilling i forskning og høyere utdanning. Både forskere, ansatte, studenter, praktikere og politikere vil ha stor nytte av boka.

Øystein Gullvåg Holter er professor emeritus ved Senter for tverrfaglig kjønnsforskning, Universitetet i Oslo. Lotta Snickare er forsker ved Det matematisk-naturvitenskapelige fakultet, Universitetet i Oslo, og ved Kungliga tekniska högskolan, Stockholm.