condition mean min max ZT0-3 0.506601 0.4233675 0.579597 ZT4-7 0.347877 0.347877 0.347877 ZT8-11 1.252195 1.252195 1.252195 ZT12-15 1.4603575 1.152355 1.76836 ZT16-19 1.564515 1.564515 1.564515 ZT20-23 1.196778 1.196778 1.196778