condition mean min max ZT0-3 15.680000001 15.680000001 15.680000001 ZT4-7 7.280555555333334 7.280555555333334 7.280555555333334 ZT8-11 6.9288888889999996 6.9288888889999996 6.9288888889999996 ZT12-15 10.042222222 10.042222222 10.042222222 ZT16-19 8.375555556666667 8.375555556666667 8.375555556666667 ZT20-23 5.271111111 5.271111111 5.271111111