Using data from New Zealand's National Education Monitoring Project, a light sampling, low stakes performance based national school assessment program, reading self-efficacy, reading enjoyment, and reading achievement were examined in samples of 8 and 12 year old children. Sample sizes were n = 480 for each group. While reading achievement increased substantially in going from age 8 to age 12, reading enjoyment and reading self-efficacy declined. Girls outperformed boys in reading achievement and showed higher levels of reading enjoyment; differences in self-efficacy by gender were minimal. Results are discussed in terms of previous research and implications for instructional practice. (Contains 2 figures and 6 tables.)