condition mean min max ZT0-3 10.250386 10.250386 10.250386 ZT4-7 11.261563500000001 11.261563500000001 11.261563500000001 ZT8-11 10.3811195 10.3811195 10.3811195 ZT12-15 9.059051499999999 9.059051499999999 9.059051499999999 ZT16-19 10.085352 10.085352 10.085352 ZT20-23 9.2682415 9.2682415 9.2682415