condition mean min max ZT0-3 439.89475 439.89475 439.89475 ZT4-7 556.76575 556.76575 556.76575 ZT8-11 549.06225 549.06225 549.06225 ZT12-15 468.3355 468.3355 468.3355 ZT16-19 467.315 467.315 467.315 ZT20-23 376.84591666666665 376.84591666666665 376.84591666666665