condition mean min max ZT0-3 8.48293 8.48293 8.48293 ZT4-7 4.733285 4.733285 4.733285 ZT8-11 8.35277 8.35277 8.35277 ZT12-15 8.68137 8.68137 8.68137 ZT16-19 8.248975000000002 8.248975000000002 8.248975000000002 ZT20-23 7.6957450000000005 7.6957450000000005 7.6957450000000005