condition mean min max ZT0-3 0.2962675 0.2962675 0.2962675 ZT4-7 0.11608845 0.11608845 0.11608845 ZT8-11 0.15051599999999998 0.15051599999999998 0.15051599999999998 ZT12-15 0.13283999999999999 0.13283999999999999 0.13283999999999999 ZT16-19 0.3702105 0.3702105 0.3702105 ZT20-23 0.251292 0.251292 0.251292