condition mean min max ZT0-3 38.5 38.5 38.5 ZT4-7 8.9 8.9 8.9 ZT8-11 8.149999999999999 8.149999999999999 8.149999999999999 ZT12-15 9.55 9.55 9.55 ZT16-19 11.3 11.3 11.3 ZT20-23 39.199999999999996 39.199999999999996 39.199999999999996