condition mean min max ZT0-3 10.43545 10.43545 10.43545 ZT4-7 8.527555 8.527555 8.527555 ZT8-11 9.447009999999999 9.447009999999999 9.447009999999999 ZT12-15 9.505265000000001 9.505265000000001 9.505265000000001 ZT16-19 14.1648 14.1648 14.1648 ZT20-23 11.52395 11.52395 11.52395