condition mean min max ZT0-3 19.5595506975 18.35980385 20.759297545 ZT4-7 14.638661975 14.526121355 14.751202594999999 ZT8-11 14.9972538225 14.110454135000001 15.88405351 ZT12-15 7.30150216 4.012433023 10.590571297 ZT16-19 2.2024903614999998 2.1496090705 2.2553716525 ZT20-23 1.47958690375 1.4061526505000002 1.5530211569999999