condition mean min max ZT0-3 11.358448 11.358448 11.358448 ZT4-7 11.230004000000001 11.230004000000001 11.230004000000001 ZT8-11 11.4289395 11.4289395 11.4289395 ZT12-15 10.2111225 10.2111225 10.2111225 ZT16-19 11.0660405 11.0660405 11.0660405 ZT20-23 11.261500999999999 11.261500999999999 11.261500999999999