condition mean min max ZT0-3 9.368883 9.368883 9.368883 ZT4-7 10.528893499999999 10.528893499999999 10.528893499999999 ZT8-11 10.1540605 10.1540605 10.1540605 ZT12-15 12.065377 12.065377 12.065377 ZT16-19 9.9902975 9.9902975 9.9902975 ZT20-23 13.029361999999999 13.029361999999999 13.029361999999999