condition mean min max ZT0-3 11.311203 11.311203 11.311203 ZT4-7 12.034590000000001 12.034590000000001 12.034590000000001 ZT8-11 12.429364499999998 12.429364499999998 12.429364499999998 ZT12-15 10.935046 10.935046 10.935046 ZT16-19 10.770673 10.770673 10.770673 ZT20-23 12.4530235 12.4530235 12.4530235