This annual report - Taranaki District Health Board

2. Proportion of babies born to mothers who smoked at two weeks after deliveryNumerator: National Maternity Collection: Number of babies born to mothers who smoked at two weeks afterdeliveryDenominator: National Maternity Collection: Number of babies born.Notes on InterpretationNote 1: The National Maternity Collection (MAT) contains information on selected publicly funded maternityservices from nine months before to three months after a birth. It integrates information from two data sources:LMC claims for payment for Primary Maternity Services provided under Section 88 of the NZ Public Health andDisability Act 2000; and data from the National Minimum Dataset (NMDS) on hospital admissions duringpregnancy, birth and the postnatal period for mother and baby.Up until June 2007, Section 88 claims data coverage was 95% of known births. However in July 2007, due to afunding change, DHB employed midwifery teams ceased to submit claims to the Ministry of Health for theirservices. Thus no LMC registration data (including smoking status) is currently available in MAT for womenwho opt for DHB based primary maternity care.Note 2: In this analysis, the baby’s hospital admission (birth) data from the NMDS was linked with maternalSection 88 claims data using a de-identified pregnancy key, with the unit of analysis being the baby rather thanthe mother (e.g. maternal information for twins is included twice in the analysis). Of the 129,635 babies bornduring 2009–2010, 1,113 (0.86%) were not able to be matched to their mother’s MAT record.Note 3: A relatively high proportion of babies (19.4% during 2009–2010) had missing information on maternalsmoking status at two weeks after delivery, with the majority of these babies having mothers who were notregistered with a LMC. The proportion with missing information was thus not randomly distributed, but ratherwas higher for Pacific babies, those with younger mothers and those from more deprived areas. Large DHBvariations were also evident (see Smoking in Pregnancy Section for further details). As a result, all of the datain this section have been presented with missing smoking status both included and excluded from the analysis.In interpreting these data, maternal smoking rates with missing responses included should be viewed asproviding an absolute minimum estimate of the number of babies whose mother’s smoked at two weeks afterdelivery. While maternal smoking rates with missing responses excluded may provide a closer approximationof the true rate, they may still be an underestimate, as a higher proportion of babies with younger mothers andthose from more deprived areas, for example, had missing smoking status data as well as higher smokingrates amongst those for whom maternal smoking status was known.Note 4: MAT does not contain details on stillborn babies as they are not assigned a NHI number at birth andare thus not reported to the National Minimum Dataset.New Zealand Distribution Number of Cigarettes SmokedIn New Zealand during 2009–2010, 19.4% of babies did not have their mother’s smokingstatus at two weeks after delivery recorded in the National Maternity Collection, with themajority of omissions being for babies whose mothers were unregistered with a LMC atdelivery. Of those babies whose mother’s smoking status was known, 84.8% had a nonsmokingmother, while 9.7% had a mother who smoked less than 10 cigarettes per dayand 5.6% had a mother who smoked 10 or more cigarettes per day (Table 35).Table 35. Number of Cigarettes Smoked at Two Weeks After Delivery, by the Mothers ofNew Zealand Babies Born 2009–2010No. of Cigarettes perDay at Two WeeksAfter DeliveryNo. of Babies:Total2009−2010No. of Babies:Annual AverageNew ZealandPercent of Babies (%)UnknownSmoking StatusIncludedUnknownSmoking StatusExcludedNon-Smoker 88,584 44,292 68.3 84.820 723 362 0.6 0.7Unknown 25,138 12,569 19.4Total 129,635 64,818 100.0 100.0Source: National Maternity CollectionSecond-hand Cigarette Smoke Exposure - 200