condition mean min max ZT0-3 11.496488 11.496488 11.496488 ZT4-7 12.192660499999999 12.192660499999999 12.192660499999999 ZT8-11 11.4834535 11.4834535 11.4834535 ZT12-15 12.7705465 12.7705465 12.7705465 ZT16-19 11.643837000000001 11.643837000000001 11.643837000000001 ZT20-23 10.986656499999999 10.986656499999999 10.986656499999999