condition mean min max ZT0-3 14.026748 14.026748 14.026748 ZT4-7 14.08551 14.08551 14.08551 ZT8-11 13.1280665 13.1280665 13.1280665 ZT12-15 11.782235 11.782235 11.782235 ZT16-19 12.1567545 12.1567545 12.1567545 ZT20-23 12.487496 12.487496 12.487496