condition mean min max ZT0-3 4.95714624975 2.948516253 6.965776246499999 ZT4-7 7.54900068075 6.2392975795000005 8.858703782 ZT8-11 12.384136347 10.395513679 14.372759015 ZT12-15 10.98242043375 10.7435765325 11.221264335 ZT16-19 10.445668319500001 9.312086304000001 11.579250335 ZT20-23 12.2903100075 11.644675435 12.935944580000001