condition mean min max ZT0-3 7.519276 7.519276 7.519276 ZT4-7 7.799125999999999 7.799125999999999 7.799125999999999 ZT8-11 9.823213500000001 9.823213500000001 9.823213500000001 ZT12-15 9.191107 9.191107 9.191107 ZT16-19 8.528444 8.528444 8.528444 ZT20-23 7.870442499999999 7.870442499999999 7.870442499999999