condition mean min max ZT0-3 43.46136666666666 37.19885 47.6806 ZT4-7 38.432050000000004 38.432050000000004 38.432050000000004 ZT8-11 19.13675 19.13675 19.13675 ZT12-15 30.229 20.568150000000003 39.889849999999996 ZT16-19 29.755450000000003 29.755450000000003 29.755450000000003 ZT20-23 46.2405 46.2405 46.2405