condition mean min max ZT0-3 120.47351 120.47351 120.47351 ZT4-7 220.8309155 220.8309155 220.8309155 ZT8-11 258.9732665 258.9732665 258.9732665 ZT12-15 265.46502599999997 265.46502599999997 265.46502599999997 ZT16-19 258.515108 258.515108 258.515108 ZT20-23 291.30368250000004 291.30368250000004 291.30368250000004