condition mean min max ZT0-3 9.624407 9.624407 9.624407 ZT4-7 10.83397 10.83397 10.83397 ZT8-11 11.9616945 11.9616945 11.9616945 ZT12-15 10.8576625 10.8576625 10.8576625 ZT16-19 10.406087 10.406087 10.406087 ZT20-23 11.5233355 11.5233355 11.5233355