condition mean min max ZT0-3 12.763813 12.763813 12.763813 ZT4-7 12.9968215 12.9968215 12.9968215 ZT8-11 12.450454 12.450454 12.450454 ZT12-15 11.931421 11.931421 11.931421 ZT16-19 12.8473 12.8473 12.8473 ZT20-23 15.0814245 15.0814245 15.0814245