condition mean min max ZT0-3 9.398385000000001 9.398385000000001 9.398385000000001 ZT4-7 5.81499 5.81499 5.81499 ZT8-11 6.50946 6.50946 6.50946 ZT12-15 9.25403 9.25403 9.25403 ZT16-19 11.35418 11.35418 11.35418 ZT20-23 9.32117 9.32117 9.32117