condition mean min max ZT0-3 131.790402 131.790402 131.790402 ZT4-7 176.612307 176.612307 176.612307 ZT8-11 194.482234 194.482234 194.482234 ZT12-15 189.6549505 189.6549505 189.6549505 ZT16-19 205.3360195 205.3360195 205.3360195 ZT20-23 140.9528185 140.9528185 140.9528185