condition mean min max ZT0-3 10.539085 10.539085 10.539085 ZT4-7 10.2425255 10.2425255 10.2425255 ZT8-11 11.843253 11.843253 11.843253 ZT12-15 11.017487 11.017487 11.017487 ZT16-19 12.0540315 12.0540315 12.0540315 ZT20-23 10.464017 10.464017 10.464017