condition mean min max ZT0-3 7.963793 7.963793 7.963793 ZT4-7 14.211797 14.211797 14.211797 ZT8-11 11.459762 11.459762 11.459762 ZT12-15 38.3982605 38.3982605 38.3982605 ZT16-19 7.5208569999999995 7.5208569999999995 7.5208569999999995 ZT20-23 8.6771685 8.6771685 8.6771685